DG-Anteros Spessartine: keeps its light when tilted
Brilliance 96 · Fire 61 · Scintillation 80 · in our census, where the T73 scores 95 · 53 · 80 in spessartine
How the DG-Anteros handles light in spessartine, measured: brilliance 96, fire 61 and 4% leakage, set against the T73 in the same stone and against the same cut in diamond.
Light Return map of the DG-Anteros in spessartine, face-up, from our own tracer at refractive index 1.79. Red, green and blue return light to the eye; gray leaks.
DG-Anteros Spessartine
Spessartine has a refractive index of 1.790 to 1.830 and a dispersion of 0.027. Its critical angle, from the low end of that range, is 34.0°, so a round design needs a pavilion of at least 36.5° for head-on light to reflect off both sides of the pavilion and leave through the table. We trace it with one index, 1.810, the midpoint of the published range, and a fire spread of 0.023, 0.86 of the published dispersion. Every picture here is our Light Return tracer at 1.790, and every figure is from the same light census that scores the other gemstones; the 3D Gemstone Simulator shows the DG-Anteros in spessartine live.
The DG-Anteros has 73 facets, a table of 53.5% of its width and a total depth of 59.4% of its width; its pavilion mains sit at 40.1°. In spessartine, the census returns 96 of 100 for brilliance and 61 for fire, against 95 and 53 for the T73, our benchmark, in the same stone; the same DG-Anteros in diamond reads 95 and 74.
Is spessartine good in a DG-Anteros? Pros and cons, measured
Compared with the T73 Round Brilliant in spessartine and with the DG-Anteros 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.
All eight scores against the T73
At a glance: the DG-Anteros in spessartine (white) against the T73 Round Brilliant in spessartine (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 spessartine: ahead on 5, level on 3.
Global85, the comparison 83, difference +2
Brilliance96, the comparison 95, difference +1
Fire61, the comparison 53, difference +8
Scintillation80, the comparison 80, difference 0
Spread101, the comparison 100, difference +1
Symmetry100, the comparison 100, difference 0
Shape-norm103, the comparison 103, difference 0
Tilt81, the comparison 77, difference +4
Face-up light census, a different measure from the Cut Grading Tool; Spread and Shape-norm above 100 sit on the ring. Spread is the census's estimate from depth alone; the face-up size in the pros and cons is measured from each model's outline. Open it in the Cut Performance Wheel; these are the same census figures as our Cut Performance Index.
What the DG-Anteros gains in spessartine
Keeps its light when tilted
Tilt 81 against 77 for the T73 Round Brilliant in spessartine: 4 points higher
Tilt is how much of its face-up brilliance a stone keeps when the census tilts it 20° about its long axis, with 2,200 rays. The DG-Anteros keeps 81 against 77 for the T73. The tilt strips below show the maps at 0°, 10°, 20° and 30°, with each picture's own leak share under it.
DG-Anteros in spessartine · Tilt 81
0° · 3% leak
10° · 3% leak
20° · 23% leak
30° · 28% leak
T73 Round Brilliant in spessartine · Tilt 77
0° · 1% leak
10° · 7% leak
20° · 30% leak
30° · 29% leak
Tilt is how much of its own face-up light a stone keeps when tilted. Each frame is the Light Return map with the stone tilted away from you by the angle shown; gray is leakage. The share under each frame is that picture's own.
1.15 ct at 6.5 mm, against 0.97 ct for the same cut in diamond (+18%)
Weight follows specific gravity: 4.16 for spessartine against 3.52 for diamond, so the same model at the same size weighs 1.15 ct here and 0.97 ct in diamond, 6.5 mm across. Nothing about the light changes with it.
A DG-Anteros 6.5 mm across, weighed from the model's measured volume and each stone's specific gravity.
Fire 61 against 74 for the DG-Anteros in diamond: 13 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 (0.023 in spessartine) and counts a ray as fire when the two directions differ by more than 0.6°. The DG-Anteros reads 61 against 74 for the same cut in diamond. The figure is the census's; the 3D Gemstone Simulator renders spessartine'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-Anteros in spessartine under the sunny-day lighting.
What helps:the DG-Elongated Hexagon reads 91 for fire in spessartine, the best of the cuts we score there.
Pick the DG-Anteros in spessartine for this: it keeps its light when tilted. The catch: it weighs more than in diamond and shows less fire than in diamond.
If that catch matters more to you, the DG-Elongated Hexagon reads 91 for fire in spessartine, 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-Anteros model we traced.
DG-Anteros Spessartine: questions
Is the DG-Anteros a good cut for spessartine?
In our census the DG-Anteros returns 96 of 100 for brilliance and 61 for fire in spessartine, against 95 and 53 for the T73 in the same stone. Against that round and against the same cut in diamond it has 1 pro and 2 cons by our thresholds; the summary above names them.
What pavilion angle does spessartine need?
At least 36.5° for a round design: spessartine's critical angle is 34.0°, 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-Anteros's pavilion mains sit at 40.1°.
How much does a DG-Anteros weigh in spessartine?
At 6.5 mm across, 1.15 ct in spessartine, against 0.97 ct for the same cut in diamond (+18%): spessartine's specific gravity is 4.16, diamond's 3.52.
Can I see the DG-Anteros in spessartine in 3D?
Yes: the 3D Gemstone Simulator renders it live, with spessartine's own refractive index and dispersion. Spessartine 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.
Get the DG-Anteros Cut files
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DG-Anteros Cut 3D files
The DG-Anteros Cut as exact geometry: 73 planar facets, real-world scale, ready for CAD,
rendering, printing and casting.
