Trillion Cut Synthetic rutile: what our light census measures
Brilliance 55 · Fire 86 · Scintillation 80 · in our census, where the T73 scores 81 · 94 · 80 in synthetic rutile
How the Trillion Cut handles light in synthetic rutile, measured: brilliance 55, fire 86 and 12% leakage, set against the T73 in the same stone and against the same cut in diamond.
Light Return map of the Trillion Cut in synthetic rutile, face-up, from our own tracer at refractive index 2.616. Red, green and blue return light to the eye; gray leaks.
Trillion Cut Synthetic rutile
Synthetic rutile has a refractive index of 2.616 to 2.903 and a dispersion of 0.330. Its critical angle, from the low end of that range, is 22.5°, so a round design needs a pavilion of at least 39.4° for head-on light to reflect off both sides of the pavilion and leave through the table. We trace it with one index, 2.760, the midpoint of the published range, and a fire spread of 0.284, 0.86 of the published dispersion. Every picture here is our Light Return tracer at 2.616, and every figure is from the same light census that scores the other gemstones; the 3D Gemstone Simulator shows the Trillion Cut in synthetic rutile live. Synthetic rutile is strongly doubly refractive (birefringence 0.287): its two rays have critical angles of 22.5° and 20.1°. Our census traces one index, so every figure for it is a rough approximation.
The Trillion Cut has 73 facets, a table of 56.6% of its width and a total depth of 50.7% of its width; its pavilion mains sit at 31.9°. In synthetic rutile, the census returns 55 of 100 for brilliance and 86 for fire, against 81 and 94 for the T73, our benchmark, in the same stone; the same Trillion Cut in diamond reads 67 and 87.
Is synthetic rutile good in a Trillion? Pros and cons, measured
Compared with the T73 Round Brilliant in synthetic rutile and with the Trillion Cut 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 Trillion Cut in synthetic rutile (white) against the T73 Round Brilliant in synthetic rutile (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 synthetic rutile: ahead on 1, level on 2, behind on 5.
Global78, the comparison 88, difference −10
Brilliance55, the comparison 81, difference −26
Fire86, the comparison 94, difference −8
Scintillation80, the comparison 80, difference 0
Spread107, the comparison 100, difference +7
Symmetry100, the comparison 100, difference 0
Shape-norm64, the comparison 87, difference −23
Tilt93, the comparison 94, difference −1
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 Trillion Cut gains in synthetic rutile
Against the T73 in synthetic rutile and the same cut in diamond, no figure of the Trillion Cut is ahead by the thresholds above. Its figures are in the wheel and the FAQ; Synthetic rutile ranks every cut we score in synthetic rutile.
What the Trillion Cut gives up in synthetic rutile
Returns less light than the T73 in synthetic rutile
Brilliance 55 against 81 for the T73 Round Brilliant in synthetic rutile: 26 points lower
Brilliance is the share of the 3,200 census rays that enter the stone and come back out of the crown towards the viewer. In synthetic rutile, whose critical angle is 22.5°, the Trillion Cut returns 55 of 100 and the T73 81. The Trillion Cut's pavilion mains sit at 31.9°, the T73's at 40.8°. The maps below show where each stone's light returns from and where it leaks.
Trillion Cut in synthetic rutile · Brilliance 55
T73 Round Brilliant in synthetic rutile · Brilliance 81
Red, green and blue = light returning to the eye; gray = leakage, light that leaves heading down or stays inside. This is the head-on view; the Brilliance score averages a wider cone of light, so the score can differ from what one picture shows.
What helps:the DG-M5 reads 97 for brilliance in synthetic rutile, the best of the cuts we score there.
0.97 ct at 6.5 mm, against 0.80 ct for the same cut in diamond (+21%)
Weight follows specific gravity: 4.26 for synthetic rutile against 3.52 for diamond, so the same model at the same size weighs 0.97 ct here and 0.80 ct in diamond, 6.5 mm across. Nothing about the light changes with it.
A Trillion Cut 6.5 mm across, weighed from the model's measured volume and each stone's specific gravity.
Fire 86 against 94 for the T73 Round Brilliant in synthetic rutile: 8 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 (0.284 in synthetic rutile) and counts a ray as fire when the two directions differ by more than 0.6°. The Trillion Cut reads 86 against 94 for the T73 in synthetic rutile. The figure is the census's; the 3D Gemstone Simulator renders synthetic rutile'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 Trillion Cut in synthetic rutile under the sunny-day lighting.
What helps:the DG-Elongated Hexagon reads 99 for fire in synthetic rutile, the best of the cuts we score there.
Our verdict on the Trillion Cut in synthetic rutile
Against the T73 in synthetic rutile and the same cut in diamond, no figure of the Trillion Cut is ahead by our thresholds. The catch: it returns less light than the T73, weighs more than in diamond and shows less fire than the T73.
If that catch matters more to you, the DG-M5 reads 97 for brilliance in synthetic rutile, 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 Trillion Cut model we traced.
Trillion Cut Synthetic rutile: questions
Is the Trillion a good cut for synthetic rutile?
In our census the Trillion Cut returns 55 of 100 for brilliance and 86 for fire in synthetic rutile, against 81 and 94 for the T73 in the same stone. Against that round and against the same cut in diamond it has 0 pros and 3 cons by our thresholds; the summary above names them.
What pavilion angle does synthetic rutile need?
At least 39.4° for a round design: synthetic rutile's critical angle is 22.5°, 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 Trillion Cut's pavilion mains sit at 31.9°.
How much does a Trillion weigh in synthetic rutile?
At 6.5 mm across, 0.97 ct in synthetic rutile, against 0.80 ct for the same cut in diamond (+21%): synthetic rutile's specific gravity is 4.26, diamond's 3.52.
Can I see the Trillion in synthetic rutile in 3D?
Yes: the 3D Gemstone Simulator renders it live, with synthetic rutile's own refractive index and dispersion. Synthetic rutile 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 Trillion Cut files
6 formatsMillimetersWatertight
Trillion Cut 3D files
The Trillion Cut as exact geometry: 73 planar facets, real-world scale, ready for CAD,
rendering, printing and casting.
Save with a bundle: the Trillion Cut cutting files are also in Faceter's Classics, 10 cuts for €22.49 until 1 December, then €29.99 (€69.90 as single files). Buy the bundle.
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).
