3D model and faceting diagram · 32 facets · 11.44 x 6.73 mm
An elongated hexagon with square points, step cut the same on both faces. It has two steps on each side of a six-facet girdle, a table in front and a flat of the same size behind. It is drawn for emerald.
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An elongated hexagon with square points, step cut the same on both faces. It has two steps on each side of a six-facet girdle, a table in front and a flat of the same size behind. It is drawn for emerald.
Both faces are finished, so it looks the same from either side. This suits pendants and open settings where the back is visible. The back flat is a window by design, so the head-on figures on this page leave it out. In emerald and amethyst, the steps beside the table also sit below the critical angle and let some light through.
Measured from the delivered model, not quoted from a standard.
The DG-Elongated Hexagon Cut was drawn for emerald, where it scores 25 for brilliance and 69 for fire. It performs best in moissanite (20 for brilliance, 93 for fire) and cubic zirconia (16 for brilliance, 97 for fire), which tie on brilliance and fire together. Its brilliance peaks in ruby and sapphire, at 27. In diamond it scores 12 for brilliance and 97 for fire, against 93 and 78 for the T73 benchmark. Its scintillation, 51, comes from its pattern of facets, so it is the same in every stone. Its back flat is a window by design, and these scores count the light through it as lost.
| Gemstone | Brilliance | Fire | Scintillation |
|---|---|---|---|
| Diamond | 12 (T73 benchmark 93) | 97 (T73 benchmark 78) | 51 (T73 benchmark 80) |
| Moissanite | 20 (T73 benchmark 86) | 93 (T73 benchmark 97) | 51 (T73 benchmark 80) |
| Cubic Zirconia | 16 (T73 benchmark 98) | 97 (T73 benchmark 87) | 51 (T73 benchmark 80) |
| Ruby | 27 (T73 benchmark 94) | 72 (T73 benchmark 37) | 51 (T73 benchmark 80) |
| Sapphire | 27 (T73 benchmark 94) | 72 (T73 benchmark 37) | 51 (T73 benchmark 80) |
| Emerald | 25 (T73 benchmark 78) | 69 (T73 benchmark 39) | 51 (T73 benchmark 80) |
| Amethyst | 25 (T73 benchmark 72) | 64 (T73 benchmark 36) | 51 (T73 benchmark 80) |
Brilliance is the share of face-up light that the stone returns. Fire is the share of that light that splits into color. Both come from our face-up light census. Scintillation is the sparkle that the facets give as the stone moves, and we read it from its facets. They are the same figures as the Cut Performance Wheel, where you can compare the DG-Elongated Hexagon Cut with any other cut. A simulation of the geometry, not a grading report.
Also scored, with the same census, in 19 more gemstones: topaz, spinel, demantoid, zircon, tourmaline, peridot, tanzanite, YAG, pyrope, almandine, spessartine, grossular, chrysoberyl, kunzite, iolite, morganite, GGG, strontium titanate and synthetic rutile. Their head-on figures are in the table below.
The same geometry behaves differently in every material. Light that meets a pavilion facet at less than the critical angle of the stone does not reflect. It passes straight out of the back and shows face-up as a window. For each stone, we measured how much of the pavilion of this model, seen face-down, is steeper than that angle. We also measured what the model weighs at its reference size. The back flat of this two-sided stone is a window by design, so the figure leaves it out.
| Stone | Refractive index | Critical angle | Pavilion reflecting head-on light | Weight at this size | Verdict |
|---|---|---|---|---|---|
| Diamond | 2.417 | 24.4° | 100% | 2.00 ct | Holds head-on light |
| Moissanite | 2.648 to 2.691 | 22.2° | 100% | 1.83 ct | Holds head-on light |
| Cubic Zirconia | 2.15 to 2.18 | 27.7° | 100% | 3.30 ct | Holds head-on light |
| Ruby | 1.762 to 1.770 | 34.6° | 100% | 2.27 ct | Holds head-on light |
| Sapphire | 1.762 to 1.770 | 34.6° | 100% | 2.27 ct | Holds head-on light |
| Emerald | 1.577 to 1.583 | 39.4° | 24% | 1.55 ct | Steepen the pavilion |
| Amethyst | 1.544 to 1.553 | 40.4° | 24% | 1.51 ct | Steepen the pavilion |
| Topaz | 1.606 to 1.644 | 38.5° | 24% | 2.01 ct | Steepen the pavilion |
| Spinel | 1.712 to 1.747 | 35.7° | 100% | 2.06 ct | Holds head-on light |
| Demantoid | 1.881 to 1.888 | 32.1° | 100% | 2.19 ct | Holds head-on light |
| Zircon | 1.925 to 1.984 | 31.3° | 100% | 2.65 ct | Holds head-on light |
| Tourmaline | 1.603 to 1.655 | 38.6° | 24% | 1.78 ct | Steepen the pavilion |
| Peridot | 1.650 to 1.690 | 37.3° | 24% | 1.90 ct | Steepen the pavilion |
| Tanzanite | 1.685 to 1.707 | 36.4° | 24% | 1.90 ct | Steepen the pavilion |
| YAG | 1.833 | 33.1° | 100% | 2.59 ct | Holds head-on light |
| Pyrope | 1.730 to 1.766 | 35.3° | 100% | 2.14 ct | Holds head-on light |
| Almandine | 1.750 to 1.830 | 34.8° | 100% | 2.34 ct | Holds head-on light |
| Spessartine | 1.790 to 1.830 | 34.0° | 100% | 2.36 ct | Holds head-on light |
| Grossular | 1.730 to 1.760 | 35.3° | 100% | 2.07 ct | Holds head-on light |
| Chrysoberyl | 1.746 to 1.755 | 34.9° | 100% | 2.12 ct | Holds head-on light |
| Kunzite | 1.660 to 1.676 | 37.0° | 24% | 1.81 ct | Steepen the pavilion |
| Iolite | 1.542 to 1.551 | 40.4° | 24% | 1.48 ct | Steepen the pavilion |
| Morganite | 1.572 to 1.600 | 39.5° | 24% | 1.62 ct | Steepen the pavilion |
| GGG | 1.970 | 30.5° | 100% | 4.01 ct | Holds head-on light |
| Strontium titanate | 2.409 | 24.5° | 100% | 2.91 ct | Holds head-on light |
| Synthetic rutile | 2.616 to 2.903 | 22.5° | 100% | 2.42 ct | Holds head-on light |
Head-on light, first reflection. The 3D Gemstone Simulator traces the full Light Return in each of these gemstones.
The DG-Elongated Hexagon stone by stone: what each gemstone gains and loses in this cut, measured.
Open it in the 3D Gemstone Simulator. Set its carat, color, clarity and cut grade in any of seven gemstones. Turn it under ten kinds of light, and watch its 3D gemstone report change as you go. Free, in your browser.
Six formats. STEP is the exact faceted solid for CAD, and 3DM is for Rhino. STL and OBJ are meshes. FBX is for Blender, 3ds Max, Maya, Cinema 4D, Unity and Unreal. GLB is for the web and AR. All are in millimeters at real-world scale, with 32 planar facets.
Yes. The cutting files contain a GemCad .asc design (26 + 6 girdles = 32 facets, 96 index, 2-fold mirror-image symmetry) and a printable faceting diagram. They also contain a tier table in CSV, with the angles, indices and cutting order.
We measured the pavilion of this model against the critical angle of each stone. In Diamond, Moissanite, Cubic Zirconia, Ruby, Sapphire, the whole pavilion reflects head-on light. In Emerald, Amethyst, part of the pavilion lets light out of the back, so we advise a steeper pavilion.
We check it facet by facet against the 3D model that it was written from. Every crown and pavilion facet within under 0.001° of the 3D model (average under 0.001°). The angles are the ones you set on the machine. The 3D model is the same stone that you render or set.
The model measures 11.44 x 6.73 x 3.05 mm, which is 2.00 ct in diamond. At the same size, it weighs 1.83 ct in moissanite, 3.30 ct in cubic zirconia, 2.27 ct in ruby, 2.27 ct in sapphire, 1.55 ct in emerald, 1.51 ct in amethyst. You can scale it uniformly to any size: the weight follows the cube of the size.
Yes. The mesh is watertight and manifold, with outward normals and no duplicate vertices, so it prints and casts without repair. Use the STEP file when you need the exact faceted solid in CAD.
The DG-Elongated Hexagon Cut as exact geometry: 32 planar facets, real-world scale, ready for CAD, rendering, printing and casting.
The DG-Elongated Hexagon Cut as a faceting design: 26 + 6 girdles = 32 facets, 96 index, 2-fold mirror-image symmetry, ready for the machine.
Not sure the files open in your software? Get the cube free: the same six formats, for your email address, used only to send them (privacy).
Questions before you buy? Email us.