The Digital Gemology Cut Performance Index scores every cut we sell for how it handles light, by ray tracing its 3D facet geometry separately in diamond, moissanite, cubic zirconia, ruby, sapphire, emerald and amethyst. It measures brilliance, fire, scintillation, tilt, symmetry, spread, shape-norm and leakage, and combines them into one overall score out of 100.
What the numbers show
- Highest overall score: DG-Miliano in diamond (92.7); DG-M5 in moissanite (95.1); DG-Rafaello in cubic zirconia (95.0); DG-M5 in ruby and sapphire (82.3); DG-M5 in emerald (77.7); and DG-M5 in amethyst (75.8).
- Highest brilliance: DG-M5 in diamond (96.7); DG-M5 in moissanite (98.1); DG-Rafaello in cubic zirconia (99.7); DG-M5 in ruby and sapphire (99.5); DG-M5 in emerald (90.0); and DG-M5 in amethyst (84.8).
- Most fire among the historic cuts: Old Single in diamond (84.2); Old Single in moissanite (98.8); T57 Round Brilliant in cubic zirconia (86.8); Mazarin in ruby and sapphire (39.7); Old European in emerald (41.5); and Old Single in amethyst (37.5).
- Most fire overall: DG-Elongated Hexagon in diamond (96.8); DG-M5 in moissanite (99.6); DG-Elongated Hexagon in cubic zirconia (97.2); Oval in ruby and sapphire (73.6); Oval in emerald (71.2); and Oval in amethyst (68.7). Fire measures how much of the returned light splits into colors, not how much light returns.
- In the stones with a refractive index below 2 (ruby and sapphire, emerald, amethyst), the typical cut leaks more light through the pavilion and scores lower overall than in diamond, moissanite or cubic zirconia. That is the stone, not the cut: compare cuts within one stone, never across stones.
- 36 of the 37 scored cuts show more fire in moissanite than in diamond. The exception is DG-Elongated Hexagon: 96.8 in diamond, 93.3 in moissanite.
- DG-M5 gains the most places between the two tables: joint 9th in diamond (87.8), 1st in moissanite (95.1).
- Cuts that score higher overall than the T73 Round Brilliant, of the 37 scored in each stone (the T73's own score in brackets): 5 in diamond (89.8); 6 in moissanite (91.0); 5 in cubic zirconia (92.8); 5 in ruby and sapphire (79.1); 4 in emerald (72.6); and 4 in amethyst (69.6).
Tables: Diamond · Moissanite · Cubic Zirconia · Ruby · Sapphire · Emerald · Amethyst
Diamond
37 cuts scored in diamond (refractive index 2.417, dispersion 0.038), ranked by the overall score. Equal figures share a place.
| Place | Cut | Category | Overall | Brilliance | Fire | Scintillation | Tilt | Symmetry | Spread | Shape-norm | Leakage % |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | DG-Miliano | House cuts | 92.7 | 94.8 | 82.4 | 98.0 | 90.4 | 100.0 | 100.7 | 102.0 | 2.6 |
| 2 | DG-Rafaello | House cuts | 92.6 | 93.9 | 80.2 | 96.0 | 96.9 | 100.0 | 101.4 | 101.0 | 4.9 |
| 3 | DG-Vitruvio | Brilliants | 91.7 | 92.6 | 78.7 | 98.4 | 92.5 | 100.0 | 99.8 | 99.5 | 2.2 |
| 4 | T105 Round Brilliant | Brilliants | 90.6 | 95.2 | 76.6 | 90.3 | 87.3 | 100.0 | 101.1 | 102.4 | 1.4 |
| 5 | DG-Broken Hearts and Arrows | Brilliants | 90.4 | 92.8 | 78.5 | 86.2 | 92.6 | 98.8 | 99.9 | 99.8 | 1.7 |
| 6 | T73 Round Brilliant | Brilliants | 89.8 | 92.9 | 78.3 | 80.3 | 92.2 | 100.0 | 99.9 | 99.9 | 1.9 |
| 7 | T57 Round Brilliant | Historic cuts | 88.6 | 92.3 | 78.8 | 71.8 | 90.4 | 100.0 | 101.3 | 99.2 | 1.9 |
| 8 | DG-Anteros | Brilliants | 88.4 | 94.6 | 74.2 | 80.3 | 84.9 | 100.0 | 101.2 | 101.7 | 2.3 |
| 9 | Old European | Historic cuts | 87.8 | 90.3 | 73.5 | 80.7 | 93.0 | 100.0 | 98.3 | 125.0 | 5.3 |
| 9 | DG-M5 | House cuts | 87.8 | 96.7 | 66.9 | 84.9 | 83.2 | 100.0 | 100.5 | 103.9 | 2.6 |
| 11 | Portuguese Bird's Nest | Jewelry cuts | 86.4 | 84.6 | 65.4 | 98.0 | 100.0 | 100.0 | 99.8 | 91.0 | 12.7 |
| 12 | DG-Octagonal Kite | House cuts | 85.9 | 88.0 | 81.9 | 59.8 | 89.0 | 100.0 | 95.8 | 102.4 | 6.6 |
| 13 | Square | Jewelry cuts | 84.1 | 85.1 | 72.5 | 78.4 | 86.4 | 100.0 | 97.7 | 111.9 | 9.7 |
| 14 | Cushion | Jewelry cuts | 83.7 | 79.8 | 73.3 | 84.9 | 91.6 | 96.8 | 98.2 | 92.8 | 9.3 |
| 15 | Trillion | Jewelry cuts | 80.9 | 66.7 | 87.3 | 80.3 | 87.1 | 100.0 | 106.6 | 77.6 | 12.7 |
| 16 | Trilliant | Jewelry cuts | 80.5 | 78.0 | 83.4 | 78.9 | 89.4 | 61.8 | 101.5 | 90.7 | 11.1 |
| 17 | Octagon | Jewelry cuts | 79.9 | 71.2 | 76.5 | 66.3 | 97.0 | 100.0 | 100.3 | 93.7 | 17.6 |
| 18 | Marquise | Jewelry cuts | 79.7 | 64.1 | 88.5 | 85.5 | 87.4 | 94.4 | 99.7 | 74.5 | 17.2 |
| 19 | Old Single | Historic cuts | 78.8 | 72.1 | 84.2 | 43.9 | 93.6 | 100.0 | 97.0 | 77.5 | 19.3 |
| 20 | Peruzzi | Historic cuts | 78.5 | 75.0 | 68.4 | 80.7 | 91.8 | 84.8 | 96.2 | 117.2 | 19.2 |
| 21 | Asscher | Jewelry cuts | 78.4 | 69.3 | 80.2 | 72.4 | 79.1 | 100.0 | 106.6 | 91.2 | 11.3 |
| 22 | Radiant Square | Jewelry cuts | 76.8 | 72.4 | 62.1 | 66.3 | 89.9 | 100.0 | 100.8 | 84.2 | 12.4 |
| 23 | Emerald Square | Jewelry cuts | 76.5 | 63.7 | 84.0 | 71.8 | 78.5 | 100.0 | 107.7 | 83.8 | 17.3 |
| 24 | Princess | Jewelry cuts | 76.2 | 56.9 | 83.0 | 78.4 | 88.9 | 100.0 | 94.9 | 88.9 | 18.1 |
| 25 | Hexagon | Jewelry cuts | 75.9 | 58.2 | 84.8 | 56.1 | 100.0 | 100.0 | 100.3 | 76.5 | 24.2 |
| 26 | Oval | Jewelry cuts | 75.0 | 46.9 | 92.5 | 87.3 | 91.7 | 98.4 | 98.7 | 54.5 | 27.0 |
| 27 | Mazarin | Historic cuts | 74.9 | 64.6 | 62.9 | 60.7 | 100.0 | 100.0 | 96.3 | 69.4 | 17.3 |
| 28 | Old Mine | Historic cuts | 74.3 | 58.8 | 72.4 | 80.7 | 100.0 | 89.6 | 97.8 | 91.9 | 32.0 |
| 29 | Pear | Jewelry cuts | 71.5 | 53.4 | 83.8 | 75.9 | 79.7 | 84.6 | 100.8 | 62.0 | 21.6 |
| 30 | Teardrop | Jewelry cuts | 71.4 | 46.0 | 89.1 | 80.7 | 80.5 | 98.0 | 100.8 | 53.5 | 28.1 |
| 31 | Triangle | Jewelry cuts | 71.2 | 52.8 | 86.4 | 34.4 | 94.4 | 100.0 | 103.5 | 69.5 | 25.4 |
| 32 | Emerald Cut | Jewelry cuts | 70.5 | 55.4 | 87.1 | 71.8 | 82.5 | 64.1 | 96.4 | 72.8 | 25.5 |
| 33 | Rectangle | Jewelry cuts | 69.2 | 50.2 | 77.1 | 63.2 | 85.4 | 100.0 | 99.7 | 66.1 | 32.3 |
| 34 | Radiant | Jewelry cuts | 65.1 | 31.5 | 76.5 | 73.6 | 100.0 | 98.9 | 104.6 | 36.7 | 41.5 |
| 35 | DG-Bowtie | House cuts | 63.1 | 26.7 | 82.2 | 85.5 | 82.9 | 94.2 | 86.9 | 31.1 | 36.1 |
| 36 | Baguette | Jewelry cuts | 56.6 | 40.4 | 62.1 | 42.6 | 100.0 | 39.3 | 97.3 | 53.2 | 38.0 |
| 37 | DG-Elongated Hexagon | House cuts | 54.6 | 12.3 | 96.8 | 50.9 | 100.0 | 72.7 | 110.7 | 16.1 | 72.8 |
| – | Heart | Jewelry cuts | Not yet scored. The census traces convex stones, and the heart’s notch makes it concave. | ||||||||
| – | DG-Cabochon | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Elongated Hexagonal Bipyramid | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Dodecahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Hexahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Icosahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Octahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Tetrahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
Moissanite
37 cuts scored in moissanite (refractive index 2.65, dispersion 0.09), ranked by the overall score. Equal figures share a place.
| Place | Cut | Category | Overall | Brilliance | Fire | Scintillation | Tilt | Symmetry | Spread | Shape-norm | Leakage % |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | DG-M5 | House cuts | 95.1 | 98.1 | 99.6 | 84.9 | 84.3 | 100.0 | 100.5 | 105.4 | 1.1 |
| 2 | DG-Vitruvio | Brilliants | 92.9 | 86.1 | 97.2 | 98.4 | 94.0 | 100.0 | 99.8 | 92.6 | 7.5 |
| 3 | DG-Miliano | House cuts | 92.0 | 85.8 | 92.7 | 98.0 | 95.1 | 100.0 | 100.7 | 92.3 | 7.7 |
| 4 | Portuguese Bird's Nest | Jewelry cuts | 91.8 | 82.2 | 95.4 | 98.0 | 100.0 | 100.0 | 99.8 | 88.4 | 10.0 |
| 5 | DG-Broken Hearts and Arrows | Brilliants | 91.7 | 87.0 | 97.0 | 86.2 | 93.8 | 98.8 | 99.9 | 93.6 | 7.3 |
| 5 | T105 Round Brilliant | Brilliants | 91.7 | 86.1 | 96.7 | 90.3 | 91.1 | 100.0 | 101.1 | 92.6 | 5.6 |
| 7 | T73 Round Brilliant | Brilliants | 91.0 | 86.0 | 97.2 | 80.3 | 94.1 | 100.0 | 99.9 | 92.5 | 7.4 |
| 8 | DG-Anteros | Brilliants | 90.9 | 91.9 | 91.1 | 80.3 | 85.7 | 100.0 | 101.2 | 98.8 | 2.8 |
| 9 | DG-Rafaello | House cuts | 90.7 | 84.2 | 90.3 | 96.0 | 97.8 | 100.0 | 101.4 | 90.6 | 12.5 |
| 10 | T57 Round Brilliant | Historic cuts | 89.8 | 85.3 | 97.6 | 71.8 | 93.2 | 100.0 | 101.3 | 91.7 | 7.8 |
| 11 | Old European | Historic cuts | 89.1 | 78.9 | 95.2 | 80.7 | 100.0 | 100.0 | 98.3 | 123.3 | 9.1 |
| 12 | Square | Jewelry cuts | 87.0 | 82.3 | 91.4 | 78.4 | 87.7 | 100.0 | 97.7 | 108.2 | 11.0 |
| 13 | Cushion | Jewelry cuts | 85.2 | 73.9 | 92.7 | 84.9 | 91.1 | 96.8 | 98.2 | 85.9 | 12.3 |
| 14 | Peruzzi | Historic cuts | 83.6 | 71.4 | 94.4 | 80.7 | 96.4 | 84.8 | 96.2 | 111.5 | 15.0 |
| 14 | DG-Octagonal Kite | House cuts | 83.6 | 70.8 | 95.1 | 59.8 | 100.0 | 100.0 | 95.8 | 82.3 | 14.4 |
| 16 | Old Single | Historic cuts | 83.2 | 76.6 | 98.8 | 43.9 | 88.9 | 100.0 | 97.0 | 82.4 | 12.5 |
| 17 | Radiant Square | Jewelry cuts | 82.3 | 70.9 | 92.5 | 66.3 | 88.3 | 100.0 | 100.8 | 82.5 | 11.0 |
| 18 | Octagon | Jewelry cuts | 82.2 | 67.0 | 94.0 | 66.3 | 99.7 | 100.0 | 100.3 | 88.1 | 19.8 |
| 19 | Trillion | Jewelry cuts | 80.5 | 59.5 | 93.3 | 80.3 | 92.3 | 100.0 | 106.6 | 69.2 | 11.8 |
| 19 | Trilliant | Jewelry cuts | 80.5 | 71.0 | 94.7 | 78.9 | 90.1 | 61.8 | 101.5 | 82.5 | 10.7 |
| 21 | Marquise | Jewelry cuts | 79.3 | 58.8 | 93.5 | 85.5 | 91.0 | 94.4 | 99.7 | 68.3 | 19.5 |
| 22 | Asscher | Jewelry cuts | 79.1 | 64.5 | 93.7 | 72.4 | 77.5 | 100.0 | 106.6 | 84.8 | 11.9 |
| 23 | Mazarin | Historic cuts | 78.5 | 61.4 | 88.3 | 60.7 | 97.7 | 100.0 | 96.3 | 66.0 | 17.1 |
| 24 | Hexagon | Jewelry cuts | 77.7 | 57.1 | 96.8 | 56.1 | 100.0 | 100.0 | 100.3 | 75.2 | 26.4 |
| 24 | Princess | Jewelry cuts | 77.7 | 51.2 | 95.3 | 78.4 | 94.8 | 100.0 | 94.9 | 79.9 | 17.1 |
| 26 | Old Mine | Historic cuts | 77.4 | 59.5 | 84.9 | 80.7 | 100.0 | 89.6 | 97.8 | 93.0 | 28.7 |
| 27 | Emerald Square | Jewelry cuts | 77.0 | 58.1 | 92.7 | 71.8 | 82.3 | 100.0 | 107.7 | 76.5 | 17.0 |
| 28 | Triangle | Jewelry cuts | 73.2 | 52.2 | 95.7 | 34.4 | 92.8 | 100.0 | 103.5 | 68.7 | 19.6 |
| 29 | Pear | Jewelry cuts | 72.9 | 49.1 | 95.1 | 75.9 | 83.4 | 84.6 | 100.8 | 57.1 | 21.7 |
| 29 | Oval | Jewelry cuts | 72.9 | 38.4 | 95.4 | 87.3 | 96.9 | 98.4 | 98.7 | 44.6 | 33.1 |
| 31 | Rectangle | Jewelry cuts | 72.3 | 50.3 | 90.1 | 63.2 | 85.8 | 100.0 | 99.7 | 66.2 | 29.2 |
| 32 | Teardrop | Jewelry cuts | 71.2 | 39.0 | 96.0 | 80.7 | 86.5 | 98.0 | 100.8 | 45.4 | 29.2 |
| 33 | Emerald Cut | Jewelry cuts | 70.2 | 50.8 | 94.5 | 71.8 | 82.4 | 64.1 | 96.4 | 66.9 | 27.2 |
| 34 | Radiant | Jewelry cuts | 69.2 | 33.2 | 91.7 | 73.6 | 100.0 | 98.9 | 104.6 | 38.6 | 36.7 |
| 35 | DG-Bowtie | House cuts | 66.9 | 29.2 | 98.1 | 85.5 | 76.7 | 94.2 | 86.9 | 34.0 | 29.1 |
| 36 | Baguette | Jewelry cuts | 55.9 | 32.2 | 74.9 | 42.6 | 100.0 | 39.3 | 97.3 | 42.4 | 42.0 |
| 37 | DG-Elongated Hexagon | House cuts | 53.6 | 19.8 | 93.3 | 50.9 | 72.9 | 72.7 | 110.7 | 26.1 | 58.1 |
| – | Heart | Jewelry cuts | Not yet scored. The census traces convex stones, and the heart’s notch makes it concave. | ||||||||
| – | DG-Cabochon | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Elongated Hexagonal Bipyramid | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Dodecahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Hexahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Icosahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Octahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Tetrahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
Cubic Zirconia
37 cuts scored in cubic zirconia (refractive index 2.16, dispersion 0.052), ranked by the overall score. Equal figures share a place.
| Place | Cut | Category | Overall | Brilliance | Fire | Scintillation | Tilt | Symmetry | Spread | Shape-norm | Leakage % |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | DG-Rafaello | House cuts | 95.0 | 99.7 | 87.1 | 96.0 | 88.2 | 100.0 | 101.4 | 107.3 | 0.1 |
| 2 | DG-Miliano | House cuts | 94.9 | 96.8 | 89.9 | 98.0 | 89.6 | 100.0 | 100.7 | 104.1 | 1.4 |
| 3 | DG-Vitruvio | Brilliants | 94.6 | 98.4 | 87.0 | 98.4 | 87.1 | 100.0 | 99.8 | 105.8 | 0.6 |
| 4 | T105 Round Brilliant | Brilliants | 93.3 | 98.4 | 85.2 | 90.3 | 86.9 | 100.0 | 101.1 | 105.8 | 0.9 |
| 5 | DG-Broken Hearts and Arrows | Brilliants | 93.2 | 98.3 | 86.7 | 86.2 | 87.6 | 98.8 | 99.9 | 105.7 | 0.5 |
| 6 | T73 Round Brilliant | Brilliants | 92.8 | 98.4 | 86.8 | 80.3 | 87.4 | 100.0 | 99.9 | 105.8 | 0.6 |
| 7 | T57 Round Brilliant | Historic cuts | 91.8 | 98.0 | 86.8 | 71.8 | 87.1 | 100.0 | 101.3 | 105.4 | 0.5 |
| 8 | Old European | Historic cuts | 89.8 | 91.6 | 83.6 | 80.7 | 91.1 | 100.0 | 98.3 | 125.0 | 7.2 |
| 9 | DG-Anteros | Brilliants | 89.0 | 92.3 | 81.7 | 80.3 | 86.9 | 100.0 | 101.2 | 99.2 | 6.5 |
| 10 | DG-Octagonal Kite | House cuts | 88.8 | 92.6 | 92.5 | 59.8 | 83.5 | 100.0 | 95.8 | 107.7 | 5.2 |
| 11 | Portuguese Bird's Nest | Jewelry cuts | 88.4 | 83.4 | 79.2 | 98.0 | 100.0 | 100.0 | 99.8 | 89.6 | 15.9 |
| 12 | Cushion | Jewelry cuts | 88.3 | 87.7 | 86.8 | 84.9 | 85.3 | 96.8 | 98.2 | 102.0 | 6.7 |
| 13 | DG-M5 | House cuts | 87.1 | 91.1 | 73.3 | 84.9 | 86.7 | 100.0 | 100.5 | 98.0 | 8.7 |
| 14 | Square | Jewelry cuts | 86.2 | 84.6 | 82.7 | 78.4 | 88.5 | 100.0 | 97.7 | 111.4 | 11.2 |
| 15 | Trillion | Jewelry cuts | 84.3 | 72.8 | 92.9 | 80.3 | 89.8 | 100.0 | 106.6 | 84.7 | 14.3 |
| 16 | Trilliant | Jewelry cuts | 84.2 | 83.6 | 94.1 | 78.9 | 87.6 | 61.8 | 101.5 | 97.2 | 11.5 |
| 17 | Radiant Square | Jewelry cuts | 82.6 | 74.4 | 81.2 | 66.3 | 98.4 | 100.0 | 100.8 | 86.5 | 12.7 |
| 18 | Octagon | Jewelry cuts | 82.3 | 75.8 | 80.0 | 66.3 | 96.8 | 100.0 | 100.3 | 99.8 | 16.4 |
| 19 | Asscher | Jewelry cuts | 80.9 | 73.8 | 88.5 | 72.4 | 76.8 | 100.0 | 106.6 | 97.1 | 14.7 |
| 20 | Marquise | Jewelry cuts | 79.8 | 66.2 | 93.0 | 85.5 | 79.6 | 94.4 | 99.7 | 77.0 | 20.1 |
| 20 | Oval | Jewelry cuts | 79.8 | 63.5 | 96.3 | 87.3 | 76.9 | 98.4 | 98.7 | 73.8 | 18.9 |
| 22 | Princess | Jewelry cuts | 79.1 | 63.4 | 91.9 | 78.4 | 85.1 | 100.0 | 94.9 | 99.0 | 22.5 |
| 23 | Emerald Square | Jewelry cuts | 78.5 | 65.3 | 88.6 | 71.8 | 84.2 | 100.0 | 107.7 | 85.9 | 20.7 |
| 24 | Peruzzi | Historic cuts | 78.2 | 67.0 | 79.2 | 80.7 | 100.0 | 84.8 | 96.2 | 104.7 | 29.6 |
| 25 | Hexagon | Jewelry cuts | 77.9 | 63.8 | 83.8 | 56.1 | 100.0 | 100.0 | 100.3 | 83.9 | 21.2 |
| 26 | Old Mine | Historic cuts | 77.4 | 64.4 | 79.5 | 80.7 | 98.9 | 89.6 | 97.8 | 100.6 | 32.7 |
| 27 | Mazarin | Historic cuts | 76.5 | 62.1 | 77.3 | 60.7 | 100.0 | 100.0 | 96.3 | 66.7 | 21.0 |
| 28 | Old Single | Historic cuts | 75.8 | 65.4 | 83.3 | 43.9 | 95.3 | 100.0 | 97.0 | 70.3 | 27.3 |
| 29 | Teardrop | Jewelry cuts | 74.1 | 54.5 | 95.2 | 80.7 | 70.2 | 98.0 | 100.8 | 63.4 | 25.7 |
| 30 | Triangle | Jewelry cuts | 72.6 | 53.7 | 94.5 | 34.4 | 92.2 | 100.0 | 103.5 | 70.7 | 27.1 |
| 31 | Emerald Cut | Jewelry cuts | 72.4 | 58.9 | 92.2 | 71.8 | 80.6 | 64.1 | 96.4 | 77.5 | 24.9 |
| 31 | Pear | Jewelry cuts | 72.4 | 59.0 | 90.1 | 75.9 | 63.7 | 84.6 | 100.8 | 68.6 | 19.4 |
| 33 | Rectangle | Jewelry cuts | 69.2 | 51.0 | 87.3 | 63.2 | 74.7 | 100.0 | 99.7 | 67.1 | 38.5 |
| 34 | Radiant | Jewelry cuts | 68.1 | 33.2 | 91.0 | 73.6 | 100.0 | 98.9 | 104.6 | 38.6 | 46.8 |
| 35 | DG-Bowtie | House cuts | 63.1 | 26.0 | 90.3 | 85.5 | 76.8 | 94.2 | 86.9 | 30.2 | 40.9 |
| 36 | Baguette | Jewelry cuts | 59.4 | 45.9 | 80.5 | 42.6 | 82.9 | 39.3 | 97.3 | 60.4 | 37.9 |
| 37 | DG-Elongated Hexagon | House cuts | 53.4 | 16.5 | 97.2 | 50.9 | 80.4 | 72.7 | 110.7 | 21.7 | 68.9 |
| – | Heart | Jewelry cuts | Not yet scored. The census traces convex stones, and the heart’s notch makes it concave. | ||||||||
| – | DG-Cabochon | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Elongated Hexagonal Bipyramid | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Dodecahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Hexahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Icosahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Octahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Tetrahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
Ruby
37 cuts scored in ruby (refractive index 1.765, dispersion 0.015), ranked by the overall score. Equal figures share a place.
| Place | Cut | Category | Overall | Brilliance | Fire | Scintillation | Tilt | Symmetry | Spread | Shape-norm | Leakage % |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | DG-M5 | House cuts | 82.3 | 99.5 | 39.3 | 84.9 | 76.1 | 100.0 | 100.5 | 107.0 | 0.5 |
| 2 | DG-Anteros | Brilliants | 81.7 | 96.8 | 43.4 | 80.3 | 77.5 | 100.0 | 101.2 | 104.1 | 2.9 |
| 3 | DG-Vitruvio | Brilliants | 80.7 | 93.9 | 37.5 | 98.4 | 75.5 | 100.0 | 99.8 | 100.9 | 6.0 |
| 4 | DG-Miliano | House cuts | 79.6 | 89.7 | 35.0 | 98.0 | 83.4 | 100.0 | 100.7 | 96.5 | 10.2 |
| 4 | DG-Broken Hearts and Arrows | Brilliants | 79.6 | 95.0 | 36.2 | 86.2 | 75.6 | 98.8 | 99.9 | 102.1 | 5.0 |
| 6 | T73 Round Brilliant | Brilliants | 79.1 | 94.5 | 37.0 | 80.3 | 75.3 | 100.0 | 99.9 | 101.6 | 5.4 |
| 7 | T105 Round Brilliant | Brilliants | 78.3 | 89.8 | 36.3 | 90.3 | 78.3 | 100.0 | 101.1 | 96.6 | 10.2 |
| 8 | T57 Round Brilliant | Historic cuts | 78.1 | 93.8 | 38.7 | 71.8 | 74.4 | 100.0 | 101.3 | 100.9 | 6.2 |
| 9 | Trillion | Jewelry cuts | 76.3 | 71.7 | 58.7 | 80.3 | 86.7 | 100.0 | 106.6 | 83.4 | 16.9 |
| 10 | Cushion | Jewelry cuts | 75.9 | 88.3 | 36.5 | 84.9 | 72.1 | 96.8 | 98.2 | 102.7 | 11.0 |
| 11 | Square | Jewelry cuts | 75.2 | 77.7 | 45.1 | 78.4 | 84.2 | 100.0 | 97.7 | 102.3 | 15.5 |
| 11 | DG-Rafaello | House cuts | 75.2 | 85.4 | 25.0 | 96.0 | 81.2 | 100.0 | 101.4 | 91.9 | 14.6 |
| 13 | Trilliant | Jewelry cuts | 74.4 | 85.7 | 52.0 | 78.9 | 74.9 | 61.8 | 101.5 | 99.6 | 11.9 |
| 14 | Old European | Historic cuts | 74.2 | 77.9 | 39.3 | 80.7 | 87.3 | 100.0 | 98.3 | 121.7 | 21.6 |
| 15 | Emerald Square | Jewelry cuts | 73.5 | 71.4 | 52.6 | 71.8 | 85.7 | 100.0 | 107.7 | 94.0 | 22.1 |
| 16 | Oval | Jewelry cuts | 72.5 | 66.2 | 73.6 | 87.3 | 58.2 | 98.4 | 98.7 | 77.0 | 25.8 |
| 17 | Octagon | Jewelry cuts | 71.8 | 78.1 | 33.5 | 66.3 | 87.1 | 100.0 | 100.3 | 102.7 | 20.4 |
| 18 | Asscher | Jewelry cuts | 71.6 | 68.0 | 52.6 | 72.4 | 84.8 | 100.0 | 106.6 | 89.5 | 29.0 |
| 19 | Princess | Jewelry cuts | 70.7 | 67.7 | 52.5 | 78.4 | 75.6 | 100.0 | 94.9 | 105.8 | 27.4 |
| 20 | DG-Octagonal Kite | House cuts | 70.5 | 73.5 | 34.3 | 59.8 | 95.3 | 100.0 | 95.8 | 85.5 | 25.7 |
| 21 | Hexagon | Jewelry cuts | 70.0 | 64.5 | 45.5 | 56.1 | 98.1 | 100.0 | 100.3 | 84.8 | 23.5 |
| 22 | Portuguese Bird's Nest | Jewelry cuts | 69.5 | 69.3 | 15.7 | 98.0 | 100.0 | 100.0 | 99.8 | 74.5 | 30.4 |
| 23 | Radiant Square | Jewelry cuts | 69.1 | 76.1 | 25.2 | 66.3 | 84.9 | 100.0 | 100.8 | 88.5 | 20.0 |
| 24 | Teardrop | Jewelry cuts | 66.8 | 59.1 | 64.3 | 80.7 | 52.1 | 98.0 | 100.8 | 68.7 | 23.4 |
| 25 | Mazarin | Historic cuts | 66.1 | 58.2 | 39.7 | 60.7 | 100.0 | 100.0 | 96.3 | 62.6 | 37.3 |
| 26 | Pear | Jewelry cuts | 64.6 | 62.1 | 56.0 | 75.9 | 55.0 | 84.6 | 100.8 | 72.3 | 26.0 |
| 27 | Marquise | Jewelry cuts | 62.6 | 55.1 | 53.7 | 85.5 | 56.4 | 94.4 | 99.7 | 64.1 | 39.2 |
| 28 | Old Mine | Historic cuts | 62.3 | 50.2 | 35.6 | 80.7 | 100.0 | 89.6 | 97.8 | 78.4 | 48.7 |
| 29 | Emerald Cut | Jewelry cuts | 61.3 | 64.6 | 47.5 | 71.8 | 54.7 | 64.1 | 96.4 | 85.0 | 25.1 |
| 30 | Rectangle | Jewelry cuts | 59.8 | 41.4 | 58.4 | 63.2 | 80.8 | 100.0 | 99.7 | 54.5 | 52.0 |
| 31 | Radiant | Jewelry cuts | 59.2 | 26.2 | 68.5 | 73.6 | 100.0 | 98.9 | 104.6 | 30.5 | 67.1 |
| 32 | Peruzzi | Historic cuts | 57.4 | 46.2 | 21.5 | 80.7 | 100.0 | 84.8 | 96.2 | 72.1 | 52.0 |
| 33 | Triangle | Jewelry cuts | 57.2 | 32.8 | 53.8 | 34.4 | 100.0 | 100.0 | 103.5 | 43.2 | 41.8 |
| 34 | DG-Bowtie | House cuts | 55.0 | 18.4 | 57.1 | 85.5 | 92.3 | 94.2 | 86.9 | 21.4 | 54.6 |
| 35 | Baguette | Jewelry cuts | 52.3 | 52.6 | 53.3 | 42.6 | 57.2 | 39.3 | 97.3 | 69.2 | 35.4 |
| 36 | Old Single | Historic cuts | 49.0 | 35.9 | 8.7 | 43.9 | 100.0 | 100.0 | 97.0 | 38.6 | 53.7 |
| 37 | DG-Elongated Hexagon | House cuts | 48.4 | 26.9 | 71.8 | 50.9 | 55.9 | 72.7 | 110.7 | 35.4 | 63.9 |
| – | Heart | Jewelry cuts | Not yet scored. The census traces convex stones, and the heart’s notch makes it concave. | ||||||||
| – | DG-Cabochon | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Elongated Hexagonal Bipyramid | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Dodecahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Hexahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Icosahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Octahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Tetrahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
Sapphire
37 cuts scored in sapphire (refractive index 1.765, dispersion 0.015), ranked by the overall score. Equal figures share a place. The figures are the same as in ruby: both are corundum, with the same refractive index (1.765) and dispersion (0.015) in the trace.
| Place | Cut | Category | Overall | Brilliance | Fire | Scintillation | Tilt | Symmetry | Spread | Shape-norm | Leakage % |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | DG-M5 | House cuts | 82.3 | 99.5 | 39.3 | 84.9 | 76.1 | 100.0 | 100.5 | 107.0 | 0.5 |
| 2 | DG-Anteros | Brilliants | 81.7 | 96.8 | 43.4 | 80.3 | 77.5 | 100.0 | 101.2 | 104.1 | 2.9 |
| 3 | DG-Vitruvio | Brilliants | 80.7 | 93.9 | 37.5 | 98.4 | 75.5 | 100.0 | 99.8 | 100.9 | 6.0 |
| 4 | DG-Miliano | House cuts | 79.6 | 89.7 | 35.0 | 98.0 | 83.4 | 100.0 | 100.7 | 96.5 | 10.2 |
| 4 | DG-Broken Hearts and Arrows | Brilliants | 79.6 | 95.0 | 36.2 | 86.2 | 75.6 | 98.8 | 99.9 | 102.1 | 5.0 |
| 6 | T73 Round Brilliant | Brilliants | 79.1 | 94.5 | 37.0 | 80.3 | 75.3 | 100.0 | 99.9 | 101.6 | 5.4 |
| 7 | T105 Round Brilliant | Brilliants | 78.3 | 89.8 | 36.3 | 90.3 | 78.3 | 100.0 | 101.1 | 96.6 | 10.2 |
| 8 | T57 Round Brilliant | Historic cuts | 78.1 | 93.8 | 38.7 | 71.8 | 74.4 | 100.0 | 101.3 | 100.9 | 6.2 |
| 9 | Trillion | Jewelry cuts | 76.3 | 71.7 | 58.7 | 80.3 | 86.7 | 100.0 | 106.6 | 83.4 | 16.9 |
| 10 | Cushion | Jewelry cuts | 75.9 | 88.3 | 36.5 | 84.9 | 72.1 | 96.8 | 98.2 | 102.7 | 11.0 |
| 11 | Square | Jewelry cuts | 75.2 | 77.7 | 45.1 | 78.4 | 84.2 | 100.0 | 97.7 | 102.3 | 15.5 |
| 11 | DG-Rafaello | House cuts | 75.2 | 85.4 | 25.0 | 96.0 | 81.2 | 100.0 | 101.4 | 91.9 | 14.6 |
| 13 | Trilliant | Jewelry cuts | 74.4 | 85.7 | 52.0 | 78.9 | 74.9 | 61.8 | 101.5 | 99.6 | 11.9 |
| 14 | Old European | Historic cuts | 74.2 | 77.9 | 39.3 | 80.7 | 87.3 | 100.0 | 98.3 | 121.7 | 21.6 |
| 15 | Emerald Square | Jewelry cuts | 73.5 | 71.4 | 52.6 | 71.8 | 85.7 | 100.0 | 107.7 | 94.0 | 22.1 |
| 16 | Oval | Jewelry cuts | 72.5 | 66.2 | 73.6 | 87.3 | 58.2 | 98.4 | 98.7 | 77.0 | 25.8 |
| 17 | Octagon | Jewelry cuts | 71.8 | 78.1 | 33.5 | 66.3 | 87.1 | 100.0 | 100.3 | 102.7 | 20.4 |
| 18 | Asscher | Jewelry cuts | 71.6 | 68.0 | 52.6 | 72.4 | 84.8 | 100.0 | 106.6 | 89.5 | 29.0 |
| 19 | Princess | Jewelry cuts | 70.7 | 67.7 | 52.5 | 78.4 | 75.6 | 100.0 | 94.9 | 105.8 | 27.4 |
| 20 | DG-Octagonal Kite | House cuts | 70.5 | 73.5 | 34.3 | 59.8 | 95.3 | 100.0 | 95.8 | 85.5 | 25.7 |
| 21 | Hexagon | Jewelry cuts | 70.0 | 64.5 | 45.5 | 56.1 | 98.1 | 100.0 | 100.3 | 84.8 | 23.5 |
| 22 | Portuguese Bird's Nest | Jewelry cuts | 69.5 | 69.3 | 15.7 | 98.0 | 100.0 | 100.0 | 99.8 | 74.5 | 30.4 |
| 23 | Radiant Square | Jewelry cuts | 69.1 | 76.1 | 25.2 | 66.3 | 84.9 | 100.0 | 100.8 | 88.5 | 20.0 |
| 24 | Teardrop | Jewelry cuts | 66.8 | 59.1 | 64.3 | 80.7 | 52.1 | 98.0 | 100.8 | 68.7 | 23.4 |
| 25 | Mazarin | Historic cuts | 66.1 | 58.2 | 39.7 | 60.7 | 100.0 | 100.0 | 96.3 | 62.6 | 37.3 |
| 26 | Pear | Jewelry cuts | 64.6 | 62.1 | 56.0 | 75.9 | 55.0 | 84.6 | 100.8 | 72.3 | 26.0 |
| 27 | Marquise | Jewelry cuts | 62.6 | 55.1 | 53.7 | 85.5 | 56.4 | 94.4 | 99.7 | 64.1 | 39.2 |
| 28 | Old Mine | Historic cuts | 62.3 | 50.2 | 35.6 | 80.7 | 100.0 | 89.6 | 97.8 | 78.4 | 48.7 |
| 29 | Emerald Cut | Jewelry cuts | 61.3 | 64.6 | 47.5 | 71.8 | 54.7 | 64.1 | 96.4 | 85.0 | 25.1 |
| 30 | Rectangle | Jewelry cuts | 59.8 | 41.4 | 58.4 | 63.2 | 80.8 | 100.0 | 99.7 | 54.5 | 52.0 |
| 31 | Radiant | Jewelry cuts | 59.2 | 26.2 | 68.5 | 73.6 | 100.0 | 98.9 | 104.6 | 30.5 | 67.1 |
| 32 | Peruzzi | Historic cuts | 57.4 | 46.2 | 21.5 | 80.7 | 100.0 | 84.8 | 96.2 | 72.1 | 52.0 |
| 33 | Triangle | Jewelry cuts | 57.2 | 32.8 | 53.8 | 34.4 | 100.0 | 100.0 | 103.5 | 43.2 | 41.8 |
| 34 | DG-Bowtie | House cuts | 55.0 | 18.4 | 57.1 | 85.5 | 92.3 | 94.2 | 86.9 | 21.4 | 54.6 |
| 35 | Baguette | Jewelry cuts | 52.3 | 52.6 | 53.3 | 42.6 | 57.2 | 39.3 | 97.3 | 69.2 | 35.4 |
| 36 | Old Single | Historic cuts | 49.0 | 35.9 | 8.7 | 43.9 | 100.0 | 100.0 | 97.0 | 38.6 | 53.7 |
| 37 | DG-Elongated Hexagon | House cuts | 48.4 | 26.9 | 71.8 | 50.9 | 55.9 | 72.7 | 110.7 | 35.4 | 63.9 |
| – | Heart | Jewelry cuts | Not yet scored. The census traces convex stones, and the heart’s notch makes it concave. | ||||||||
| – | DG-Cabochon | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Elongated Hexagonal Bipyramid | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Dodecahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Hexahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Icosahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Octahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Tetrahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
Emerald
37 cuts scored in emerald (refractive index 1.578, dispersion 0.012), ranked by the overall score. Equal figures share a place.
| Place | Cut | Category | Overall | Brilliance | Fire | Scintillation | Tilt | Symmetry | Spread | Shape-norm | Leakage % |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | DG-M5 | House cuts | 77.7 | 90.0 | 46.2 | 84.9 | 64.5 | 100.0 | 100.5 | 96.8 | 10.0 |
| 2 | DG-Anteros | Brilliants | 77.3 | 86.0 | 52.0 | 80.3 | 69.3 | 100.0 | 101.2 | 92.4 | 14.0 |
| 3 | DG-Vitruvio | Brilliants | 74.4 | 77.7 | 39.8 | 98.4 | 77.5 | 100.0 | 99.8 | 83.5 | 22.3 |
| 4 | DG-Broken Hearts and Arrows | Brilliants | 73.2 | 77.8 | 39.2 | 86.2 | 79.1 | 98.8 | 99.9 | 83.6 | 22.2 |
| 5 | T73 Round Brilliant | Brilliants | 72.6 | 78.2 | 39.0 | 80.3 | 76.9 | 100.0 | 99.9 | 84.1 | 21.8 |
| 6 | T57 Round Brilliant | Historic cuts | 71.7 | 77.9 | 40.3 | 71.8 | 76.0 | 100.0 | 101.3 | 83.8 | 22.0 |
| 7 | DG-Miliano | House cuts | 70.9 | 67.0 | 34.3 | 98.0 | 92.4 | 100.0 | 100.7 | 72.1 | 33.0 |
| 8 | T105 Round Brilliant | Brilliants | 70.4 | 71.4 | 33.8 | 90.3 | 82.7 | 100.0 | 101.1 | 76.8 | 28.6 |
| 9 | Trillion | Jewelry cuts | 70.2 | 63.4 | 47.5 | 80.3 | 86.1 | 100.0 | 106.6 | 73.7 | 26.5 |
| 10 | Old European | Historic cuts | 69.9 | 64.2 | 41.5 | 80.7 | 95.5 | 100.0 | 98.3 | 100.3 | 35.8 |
| 11 | Square | Jewelry cuts | 69.8 | 68.2 | 38.3 | 78.4 | 85.2 | 100.0 | 97.7 | 89.8 | 25.5 |
| 12 | Asscher | Jewelry cuts | 69.0 | 62.0 | 54.8 | 72.4 | 83.7 | 100.0 | 106.6 | 81.5 | 36.8 |
| 13 | Oval | Jewelry cuts | 68.8 | 55.0 | 71.2 | 87.3 | 71.2 | 98.4 | 98.7 | 64.0 | 40.7 |
| 14 | Emerald Square | Jewelry cuts | 68.1 | 66.4 | 46.0 | 71.8 | 76.8 | 100.0 | 107.7 | 87.4 | 31.6 |
| 15 | Cushion | Jewelry cuts | 67.1 | 74.4 | 26.6 | 84.9 | 67.5 | 96.8 | 98.2 | 86.5 | 24.5 |
| 16 | Octagon | Jewelry cuts | 67.0 | 68.7 | 34.1 | 66.3 | 83.3 | 100.0 | 100.3 | 90.4 | 31.1 |
| 17 | DG-Rafaello | House cuts | 64.7 | 53.6 | 27.5 | 96.0 | 100.0 | 100.0 | 101.4 | 57.6 | 46.4 |
| 18 | DG-Octagonal Kite | House cuts | 64.0 | 54.4 | 40.5 | 59.8 | 100.0 | 100.0 | 95.8 | 63.3 | 45.5 |
| 19 | Hexagon | Jewelry cuts | 63.9 | 52.2 | 41.3 | 56.1 | 99.9 | 100.0 | 100.3 | 68.7 | 37.1 |
| 20 | Trilliant | Jewelry cuts | 63.8 | 68.3 | 40.5 | 78.9 | 72.2 | 61.8 | 101.5 | 79.5 | 31.4 |
| 21 | Teardrop | Jewelry cuts | 63.6 | 53.7 | 62.8 | 80.7 | 52.9 | 98.0 | 100.8 | 62.5 | 36.0 |
| 22 | Pear | Jewelry cuts | 62.7 | 56.4 | 58.5 | 75.9 | 57.2 | 84.6 | 100.8 | 65.6 | 34.2 |
| 23 | Radiant Square | Jewelry cuts | 59.8 | 56.7 | 20.0 | 66.3 | 87.8 | 100.0 | 100.8 | 65.9 | 41.5 |
| 24 | Princess | Jewelry cuts | 59.4 | 50.9 | 31.9 | 78.4 | 77.3 | 100.0 | 94.9 | 79.5 | 44.7 |
| 25 | Mazarin | Historic cuts | 58.2 | 45.6 | 30.8 | 60.7 | 98.1 | 100.0 | 96.3 | 49.0 | 52.7 |
| 26 | Triangle | Jewelry cuts | 57.3 | 27.0 | 64.6 | 34.4 | 100.0 | 100.0 | 103.5 | 35.5 | 42.8 |
| 27 | Marquise | Jewelry cuts | 57.2 | 42.9 | 50.8 | 85.5 | 61.4 | 94.4 | 99.7 | 49.9 | 53.6 |
| 28 | Rectangle | Jewelry cuts | 56.1 | 28.5 | 54.6 | 63.2 | 100.0 | 100.0 | 99.7 | 37.5 | 68.0 |
| 29 | Old Mine | Historic cuts | 55.7 | 40.2 | 24.8 | 80.7 | 100.0 | 89.6 | 97.8 | 62.8 | 59.5 |
| 30 | Emerald Cut | Jewelry cuts | 55.5 | 58.3 | 36.4 | 71.8 | 51.9 | 64.1 | 96.4 | 76.7 | 34.7 |
| 31 | Portuguese Bird's Nest | Jewelry cuts | 54.9 | 42.4 | 2.0 | 98.0 | 100.0 | 100.0 | 99.8 | 45.6 | 57.6 |
| 32 | Radiant | Jewelry cuts | 54.3 | 21.8 | 55.7 | 73.6 | 100.0 | 98.9 | 104.6 | 25.4 | 74.8 |
| 33 | DG-Bowtie | House cuts | 50.1 | 13.2 | 70.4 | 85.5 | 63.2 | 94.2 | 86.9 | 15.4 | 65.8 |
| 34 | Baguette | Jewelry cuts | 48.8 | 42.0 | 58.4 | 42.6 | 60.4 | 39.3 | 97.3 | 55.3 | 50.0 |
| 35 | Peruzzi | Historic cuts | 48.7 | 30.0 | 14.6 | 80.7 | 100.0 | 84.8 | 96.2 | 46.8 | 69.1 |
| 36 | DG-Elongated Hexagon | House cuts | 47.7 | 25.3 | 68.7 | 50.9 | 61.4 | 72.7 | 110.7 | 33.3 | 68.6 |
| 37 | Old Single | Historic cuts | 45.0 | 16.8 | 32.1 | 43.9 | 100.0 | 100.0 | 97.0 | 18.1 | 75.3 |
| – | Heart | Jewelry cuts | Not yet scored. The census traces convex stones, and the heart’s notch makes it concave. | ||||||||
| – | DG-Cabochon | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Elongated Hexagonal Bipyramid | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Dodecahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Hexahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Icosahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Octahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Tetrahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
Amethyst
37 cuts scored in amethyst (refractive index 1.548, dispersion 0.011), ranked by the overall score. Equal figures share a place.
| Place | Cut | Category | Overall | Brilliance | Fire | Scintillation | Tilt | Symmetry | Spread | Shape-norm | Leakage % |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | DG-M5 | House cuts | 75.8 | 84.8 | 49.5 | 84.9 | 63.2 | 100.0 | 100.5 | 91.2 | 15.2 |
| 2 | DG-Anteros | Brilliants | 75.7 | 81.8 | 53.6 | 80.3 | 68.6 | 100.0 | 101.2 | 87.9 | 18.2 |
| 3 | DG-Vitruvio | Brilliants | 71.4 | 71.1 | 36.4 | 98.4 | 81.3 | 100.0 | 99.8 | 76.4 | 28.9 |
| 4 | DG-Broken Hearts and Arrows | Brilliants | 69.8 | 70.9 | 34.6 | 86.2 | 82.5 | 98.8 | 99.9 | 76.3 | 29.1 |
| 5 | T73 Round Brilliant | Brilliants | 69.6 | 71.9 | 35.6 | 80.3 | 80.3 | 100.0 | 99.9 | 77.3 | 28.1 |
| 6 | T57 Round Brilliant | Historic cuts | 68.6 | 71.4 | 36.8 | 71.8 | 79.2 | 100.0 | 101.3 | 76.8 | 28.6 |
| 7 | Trillion | Jewelry cuts | 68.3 | 60.2 | 44.0 | 80.3 | 87.5 | 100.0 | 106.6 | 70.0 | 29.9 |
| 8 | T105 Round Brilliant | Brilliants | 67.9 | 65.3 | 31.2 | 90.3 | 86.9 | 100.0 | 101.1 | 70.2 | 34.7 |
| 9 | Asscher | Jewelry cuts | 67.6 | 60.1 | 51.9 | 72.4 | 84.1 | 100.0 | 106.6 | 79.0 | 38.8 |
| 9 | Oval | Jewelry cuts | 67.6 | 52.3 | 68.7 | 87.3 | 74.0 | 98.4 | 98.7 | 60.8 | 43.4 |
| 11 | DG-Miliano | House cuts | 67.5 | 60.4 | 27.9 | 98.0 | 97.3 | 100.0 | 100.7 | 64.9 | 39.6 |
| 12 | Square | Jewelry cuts | 67.4 | 65.3 | 33.8 | 78.4 | 84.2 | 100.0 | 97.7 | 86.0 | 28.7 |
| 13 | Old European | Historic cuts | 67.1 | 58.6 | 36.5 | 80.7 | 100.0 | 100.0 | 98.3 | 91.5 | 41.4 |
| 14 | Emerald Square | Jewelry cuts | 64.7 | 61.1 | 40.0 | 71.8 | 77.7 | 100.0 | 107.7 | 80.4 | 36.5 |
| 15 | Cushion | Jewelry cuts | 64.1 | 68.7 | 24.3 | 84.9 | 67.5 | 96.8 | 98.2 | 79.9 | 30.7 |
| 16 | Octagon | Jewelry cuts | 63.9 | 64.3 | 28.4 | 66.3 | 83.2 | 100.0 | 100.3 | 84.6 | 35.6 |
| 17 | Hexagon | Jewelry cuts | 62.1 | 48.9 | 39.4 | 56.1 | 100.0 | 100.0 | 100.3 | 64.3 | 40.5 |
| 18 | Teardrop | Jewelry cuts | 61.6 | 49.2 | 60.4 | 80.7 | 56.3 | 98.0 | 100.8 | 57.2 | 40.5 |
| 19 | Pear | Jewelry cuts | 60.8 | 51.9 | 59.9 | 75.9 | 56.7 | 84.6 | 100.8 | 60.3 | 39.2 |
| 19 | Trilliant | Jewelry cuts | 60.8 | 63.3 | 33.7 | 78.9 | 75.6 | 61.8 | 101.5 | 73.6 | 36.2 |
| 21 | DG-Rafaello | House cuts | 60.7 | 45.2 | 26.3 | 96.0 | 100.0 | 100.0 | 101.4 | 48.6 | 54.8 |
| 22 | DG-Octagonal Kite | House cuts | 60.4 | 49.8 | 32.6 | 59.8 | 100.0 | 100.0 | 95.8 | 58.0 | 50.1 |
| 23 | Radiant Square | Jewelry cuts | 57.3 | 51.2 | 20.5 | 66.3 | 86.9 | 100.0 | 100.8 | 59.5 | 46.9 |
| 24 | Triangle | Jewelry cuts | 56.8 | 27.8 | 61.3 | 34.4 | 100.0 | 100.0 | 103.5 | 36.6 | 43.3 |
| 25 | Mazarin | Historic cuts | 56.6 | 43.0 | 28.4 | 60.7 | 98.3 | 100.0 | 96.3 | 46.3 | 55.5 |
| 26 | Princess | Jewelry cuts | 56.3 | 45.1 | 25.2 | 78.4 | 81.9 | 100.0 | 94.9 | 70.5 | 50.2 |
| 27 | Marquise | Jewelry cuts | 56.0 | 38.2 | 47.8 | 85.5 | 71.0 | 94.4 | 99.7 | 44.4 | 58.6 |
| 28 | Old Mine | Historic cuts | 54.1 | 37.6 | 22.4 | 80.7 | 100.0 | 89.6 | 97.8 | 58.7 | 62.1 |
| 29 | Rectangle | Jewelry cuts | 53.2 | 23.8 | 50.3 | 63.2 | 100.0 | 100.0 | 99.7 | 31.3 | 72.2 |
| 30 | Emerald Cut | Jewelry cuts | 52.6 | 53.0 | 32.0 | 71.8 | 54.3 | 64.1 | 96.4 | 69.7 | 41.0 |
| 31 | Portuguese Bird's Nest | Jewelry cuts | 52.4 | 37.0 | 1.4 | 98.0 | 100.0 | 100.0 | 99.8 | 39.8 | 63.0 |
| 32 | Radiant | Jewelry cuts | 50.8 | 20.2 | 41.5 | 73.6 | 100.0 | 98.9 | 104.6 | 23.5 | 76.5 |
| 33 | DG-Bowtie | House cuts | 48.6 | 11.9 | 64.1 | 85.5 | 67.7 | 94.2 | 86.9 | 13.9 | 70.2 |
| 34 | Baguette | Jewelry cuts | 48.1 | 39.8 | 58.9 | 42.6 | 62.1 | 39.3 | 97.3 | 52.4 | 53.6 |
| 35 | DG-Elongated Hexagon | House cuts | 47.1 | 25.2 | 63.9 | 50.9 | 64.6 | 72.7 | 110.7 | 33.1 | 69.6 |
| 36 | Peruzzi | Historic cuts | 46.7 | 26.0 | 13.3 | 80.7 | 100.0 | 84.8 | 96.2 | 40.6 | 73.3 |
| 37 | Old Single | Historic cuts | 45.1 | 15.1 | 37.5 | 43.9 | 100.0 | 100.0 | 97.0 | 16.3 | 79.0 |
| – | Heart | Jewelry cuts | Not yet scored. The census traces convex stones, and the heart’s notch makes it concave. | ||||||||
| – | DG-Cabochon | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Elongated Hexagonal Bipyramid | House cuts | Not yet scored. This stone has no table, so the head-on light measure we use for the other cuts does not apply. | ||||||||
| – | Dodecahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Hexahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Icosahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Octahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
| – | Tetrahedron | Platonic solids | Not yet scored. We have not set the census up for the Platonic solids. They are geometric models, not gem cuts, and we keep them out of the gem rankings. | ||||||||
Select a column heading to sort a table. Each cut name opens the cut's page.
How we compute the scores
We trace light through a 3D model of each cut, one ray at a time. The same code computes the scores on our Cut Performance Wheel, cut pages and gemstone pages, so all of them show the same figures.
Geometry
Each cut is a set of flat facets that close into a convex solid. For most cuts this is the facet set our census uses for that design. For DG-M5 and DG-Rafaello it is a facet set that matches our 3D model to within 0.09°. For DG-Miliano, DG-Elongated Hexagon, DG-Octagonal Kite and DG-Broken Hearts and Arrows it is our own 3D model. Every stone is scaled so that its longest side is 1, with the table up.
For the Princess, Radiant, Oval, Trilliant and DG-Vitruvio (at the girdle only), the census facet set differs a little from the 3D model we sell. The scores are for the census facet set.
Lighting and viewing
3,200 rays fall on the stone from above, at most about 7° from vertical, more of them near vertical (cosine-weighted). They cover the whole face-up outline. Only rays that enter the stone count. The random pattern has a fixed seed, so every run gives the same scores.
A ray counts as returned when it leaves through the crown within 64° of vertical after at least one reflection inside the pavilion. A ray that leaves through the pavilion counts as leakage. A ray that leaves through the crown without touching the pavilion, or more than 64° from vertical, does not count as returned.
The 7° light cone and the 64° viewing limit are fixed settings of our method, the same for every cut.
Refractive index and ray tracing
At each surface the ray refracts by Snell's law, or reflects totally when it meets the surface beyond the critical angle. A ray is followed for up to 12 reflections inside the stone. We use the refractive index and dispersion of diamond 2.417 (dispersion 0.038), moissanite 2.65 (dispersion 0.09), cubic zirconia 2.16 (dispersion 0.052), ruby 1.765 (dispersion 0.015), sapphire 1.765 (dispersion 0.015), emerald 1.578 (dispersion 0.012), amethyst 1.548 (dispersion 0.011). That is why each stone has its own table: the same cut handles light differently in each, so never compare a score in one stone with a score in another. Ruby and sapphire are both corundum, so they share one refractive index and one set of figures.
For fire, the exit is traced again at the refractive index minus and plus the dispersion. When the two directions differ by more than 0.6°, the returned ray counts as fire.
The trace is all or nothing: it does not split a ray into reflected and refracted parts at a surface (Fresnel reflection), and it leaves out absorption, color, inclusions and polish. Brilliance here is therefore a different measure from the one in our Cut Grading Tool, for example. For colored stones such as ruby, sapphire, emerald and amethyst this matters most: the scores compare how cuts handle light in that stone, but a dark stone looks darker than its score, because the trace does not absorb any light.
The 0.6° fire threshold is a fixed setting of our method, the same for every cut.
What each score means
- Overall
- The combined score: 0.34 × brilliance + 0.20 × fire + 0.16 × tilt + 0.10 × scintillation + 0.10 × symmetry + 0.10 × (100 − leakage).
- Brilliance
- The share of the light that enters the stone and comes back out of the crown towards the viewer, in per cent.
- Fire
- The share of that returned light whose colors spread apart by more than 0.6° as it leaves, in per cent. It does not say how much light returns.
- Scintillation
- A sparkle score from the number of facets the stone really shows: 100 × (1 − e^(−facets / 45)). It depends only on the geometry.
- Tilt
- How much of its face-up brilliance the stone keeps when tilted 20°, capped at 100.
- Symmetry
- How evenly the pavilion facets of each design family are cut: 100 − 6 × their scatter in degrees.
- Spread
- Face-up size for the weight compared with a stone 61.5% deep: 100 × ∛(61.5 / depth %), capped at 130. Above 100 means larger than that stone.
- Shape-norm
- Brilliance compared with what the shape family can reach (93 for round brilliants, 86 for fancy brilliants, 76 for step cuts, 64 for others), capped at 125.
- Leakage
- The share of the light that enters and leaks out through the pavilion, in per cent. Lower is better.
Tilt reruns the trace with the stone turned 20° about its long axis, with 2,200 rays. Spread uses the depth of the cut as a share of its width. Scintillation, symmetry and spread depend only on the shape, so they are the same in every stone. Spread and shape-norm can be above 100.
The overall weights (0.34, 0.20, 0.16, 0.10, 0.10, 0.10), the scintillation constant 45, the symmetry factor 6, the 61.5% reference depth, the 20° tilt and the shape-family ceilings (93, 86, 76, 64) are fixed settings of our method, the same for every cut. So the scores compare cuts with each other; they are not absolute measures.
Cuts we do not score yet
The census traces convex stones with a table. The Heart is concave at its notch. The DG-Cabochon and the Elongated Hexagonal Bipyramid have no table. We have not set the census up for the Platonic solids, which are geometric models, not gem cuts. Each table lists these cuts with the reason.
Version and rounding
Engine version census-ba47e2e1.13d5809b, from the code that computes the scores: it changes
whenever that code changes. The tables show one decimal. The downloads keep the full figures. Our cut pages show
whole numbers.
Last updated: .
Download the data
The same data as the tables, with the full figures, the engine version and the date. One row per cut and material.
- cut-performance-index.csv CSV
- cut-performance-index.json JSON
- Digital Gemology Cut Performance Index on Kaggle Kaggle
- DigitalGemology/cut-performance-index on Hugging Face Hugging Face
- Archived on Zenodo, DOI 10.5281/zenodo.23844870 Zenodo
To cite the data: Digital Gemology. Digital Gemology Cut Performance Index. Zenodo. doi:10.5281/zenodo.23844870
For software: GET /api/cut-index returns the JSON, and our MCP server at /mcp has the
tool get_cut_scores. See For AI agents.
License: CC BY 4.0. Use and share the data freely, with credit to Digital Gemology and a link to this page.