Brilliance 56 · Fire 27 · Scintillation 96 · in our census, where the T73 scores 79 · 39 · 80 in morganite
How the DG-Rafaello handles light in morganite, measured: brilliance 56, fire 27 and 44% leakage, set against the T73 in the same stone and against the same cut in diamond.
Morganite has a refractive index of 1.572 to 1.600 and a dispersion of 0.014. Its critical angle, from the low end of that range, is 39.5°, so a round design needs a pavilion of at least 39.5° for head-on light to reflect off both sides of the pavilion and leave through the table. We trace it with one index, 1.586, the midpoint of the published range, and a fire spread of 0.012, 0.86 of the published dispersion. Every picture here is our Light Return tracer at 1.572, and every figure is from the same light census that scores the other gemstones; the 3D Gemstone Simulator shows the DG-Rafaello in morganite live.
The DG-Rafaello has 145 facets and a total depth of 59.0% of its width; its pavilion mains sit at 40.0°. In morganite, the census returns 56 of 100 for brilliance and 27 for fire, against 79 and 39 for the T73, our benchmark, in the same stone; the same DG-Rafaello in diamond reads 94 and 80.
Compared with the T73 Round Brilliant in morganite and with the DG-Rafaello in diamond. A difference counts from 3 points (Brilliance, Fire, Tilt, Leakage), 5 (Scintillation, Symmetry), 4% (face-up size per carat) or 5% (weight); Tilt counts as a pro only for a stone within 5 points of the brilliance it is compared with. How we measure.
At a glance: the DG-Rafaello in morganite (white) against the T73 Round Brilliant in morganite (dashed): solid white where it reaches further, hatched where it falls short. Each pro and con is explained, with pictures, below.
Against the T73 Round Brilliant in morganite: ahead on 3, level on 1, behind on 4.
0.76 ct at 6.5 mm, against 0.94 ct for the same cut in diamond (−19%)
Weight follows specific gravity: 2.855 for morganite against 3.52 for diamond, so the same model at the same size weighs 0.76 ct here and 0.94 ct in diamond, 6.5 mm across. Nothing about the light changes with it.
Try it yourself: Weights in every gemstone on the DG-Rafaello page
Scintillation 96 against 80 for the T73 Round Brilliant in morganite: 16 points higher
Scintillation follows the number of facets the stone shows: 100 × (1 − e^(−facets / 45)). The DG-Rafaello has 145 facets and the T73 73, so 96 against 80. It depends on the geometry alone, so it is the same in every stone.
DG-Rafaello · 145 facets · Scintillation 96
T73 Round Brilliant · 73 facets · Scintillation 80
Try it yourself: Compare the Scintillation spoke in the Cut Performance Wheel
Face-up size 106 against 100 for the T73 Round Brilliant in morganite (T73 = 100): 6% more face-up area for the same weight
Face-up size is the outline's area per carat, measured from each model (T73 = 100): 106 for the DG-Rafaello against 100 for the T73. The same volume spread over a longer or shallower outline shows more face for the weight; it is the same in every stone, because specific gravity scales every cut alike.
DG-Rafaello · 7.12 mm at 1.00 ct · Face-up size 106
T73 Round Brilliant · 6.94 mm at 1.00 ct · Face-up size 100
Try it yourself: See its size at 1.00 ct in morganite in the 3D Gemstone Simulator
Fire 27 against 80 for the DG-Rafaello in diamond: 53 points lower
Fire is the share of the returned light that splits into color at the exit facet: the census traces each exit again at the refractive index minus and plus the fire spread (0.012 in morganite) and counts a ray as fire when the two directions differ by more than 0.6°. The DG-Rafaello reads 27 against 80 for the same cut in diamond. The figure is the census's; the 3D Gemstone Simulator renders morganite's fire live.
The fire figure is the census's, traced at the refractive index minus and plus the fire spread. See the fire in the 3D Gemstone Simulator: the DG-Rafaello in morganite under the sunny-day lighting.
What helps: the Oval Cut reads 70 for fire in morganite, the best of the cuts we score there.
Leakage 44 against 5 for the DG-Rafaello in diamond: 39 points higher
Leakage is the share of the census rays that enter the stone and leave through the pavilion, or through the crown heading down. The DG-Rafaello leaks 44% in morganite against 5% for the same cut in diamond. Grey in the maps below is leaking light; the share under each picture is that picture's own.
DG-Rafaello in morganite · Leakage 44
DG-Rafaello in diamond · Leakage 5
What helps: the DG-M5 reads 9% for leakage in morganite, the best of the cuts we score there.
Try it yourself: Tilt it yourself in the simulator's light map
Brilliance 56 against 94 for the DG-Rafaello in diamond: 38 points lower
The same cut in diamond returns 94. Morganite bends light less than diamond: its critical angle is 39.5°, diamond's 24.4°, so a pavilion facet has to be steeper before light reflects off it rather than passing out. The DG-Rafaello's pavilion returns less of morganite's light than of diamond's, as the two maps show.
DG-Rafaello in morganite · Brilliance 56
DG-Rafaello in diamond · Brilliance 94
What helps: the DG-M5 reads 91 for brilliance in morganite, the best of the cuts we score there.
Try it yourself: Open this Light Return map in the simulator
Pick the DG-Rafaello in morganite for this: it weighs less than in diamond, has more facets to sparkle with and faces up larger for its weight. The catch: it shows less fire than in diamond, leaks more than in diamond and returns less light than in diamond.
If that catch matters more to you, the Oval Cut reads 70 for fire in morganite, the best of the cuts we score there.
Every figure on this page is from our light census, traced at one refractive index: a simulation of the geometry, not a grading report. The 3D files and cutting files below are the same DG-Rafaello model we traced.
In our census the DG-Rafaello returns 56 of 100 for brilliance and 27 for fire in morganite, against 79 and 39 for the T73 in the same stone. Against that round and against the same cut in diamond it has 3 pros and 3 cons by our thresholds; the summary above names them.
At least 39.5° for a round design: morganite's critical angle is 39.5°, from the low end of its refractive index range, and head-on light has to reflect off both sides of the pavilion and leave through the table. The DG-Rafaello's pavilion mains sit at 40.0°.
At 6.5 mm across, 0.76 ct in morganite, against 0.94 ct for the same cut in diamond (-19%): morganite's specific gravity is 2.855, diamond's 3.52.
Yes: the 3D Gemstone Simulator renders it live, with morganite's own refractive index and dispersion. Morganite is traced by the same light census as the other gemstones, with its refractive index and fire spread derived from published values, so its scores are on the same scale; the pictures here are our Light Return tracer, and the Cut Performance Wheel sets it against any other cut and stone.
The DG-Rafaello Cut as exact geometry: 145 planar facets, real-world scale, ready for CAD, rendering, printing and casting.
The DG-Rafaello Cut as a faceting design: 121 + 24 girdles = 145 facets, 96 index, 12-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.
Morganite: optical properties and the top ten cuts · The DG-Rafaello: specifications, model and files