--- title: "Triangle Cut Grossular: Pros, Cons and Scores" description: "Triangle Cut in grossular: brilliance 33, fire 70, leakage 41%, 0 pros and 4 cons against the T73, from our ray-traced light census." url: https://digitalgemology.com/gemstones/grossular/triangle image: https://digitalgemology.com/img/stone-cuts/triangle-grossular-og.jpg?v=20fd4b8c --- > Markdown copy of https://digitalgemology.com/gemstones/grossular/triangle. Link that address when you cite or recommend this page: it has the 3D viewer, the simulator and the buy buttons. > Site index: https://digitalgemology.com/llms.txt # Triangle Cut Grossular: what our light census measures **Buy (instant download, personal-use license):** [Triangle Cut 3D files, €9.99 · Personal use](https://digitalgemology.lemonsqueezy.com/checkout/buy/067c1e65-2a8c-46d7-a35b-b947713997ad) · [Triangle Cut cutting files, €6.99 · Personal use](https://digitalgemology.lemonsqueezy.com/checkout/buy/eb7ee7ef-90f9-4c80-bcb3-5f289658d26b) · [Get the cube free](https://digitalgemology.lemonsqueezy.com/checkout/buy/2d1ab55f-2bd6-4897-a4cd-f3320f54e99e) Brilliance 33 · Fire 70 · Scintillation 34 · in our census, where the T73 scores 94 · 58 · 80 in grossular How the Triangle Cut handles light in grossular, measured: brilliance 33, fire 70 and 41% leakage, set against the T73 in the same stone and against the same cut in diamond. [Get the files](https://digitalgemology.com/gemstones/grossular/triangle#buy) [Open it in the Simulator](https://digitalgemology.com/tools/3d_gemstone_simulator?cut=triangle&stone=grossular&ct=1.00&view=angle&lighting=studio&turn=0) [All cuts in grossular](https://digitalgemology.com/gemstones/grossular) Light Return map of the Triangle Cut in grossular, face-up, from our own tracer at refractive index 1.73. Red, green and blue return light to the eye; gray leaks. ## Triangle Cut Grossular Grossular has a refractive index of 1.730 to 1.760 and a dispersion of 0.028. Its critical angle, from the low end of that range, is 35.3°, so a round design needs a pavilion of at least 36.2° for head-on light to reflect off both sides of the pavilion and leave through the table. We trace it with one index, 1.745, the midpoint of the published range, and a fire spread of 0.024, 0.86 of the published dispersion. Every picture here is our Light Return tracer at 1.730, and every figure is from the same light census that scores the other gemstones; the 3D Gemstone Simulator shows the Triangle Cut in grossular live. The Triangle Cut has 19 facets, a table of 60.0% of its width and a total depth of 55.4% of its width; its pavilion mains sit at 41.8°. In grossular, the census returns 33 of 100 for brilliance and 70 for fire, against 94 and 58 for the T73, our benchmark, in the same stone; the same Triangle Cut in diamond reads 53 and 86. ## Is grossular good in a Triangle? Pros and cons, measured ### Pros No figure ahead by our thresholds ### Cons - [Returns less light than the T73 in grossular](https://digitalgemology.com/gemstones/grossular/triangle#con-brilliance) 33 vs 94 - [Fewer facets, less sparkle](https://digitalgemology.com/gemstones/grossular/triangle#con-scint) 34 vs 80 - [Leaks more light than the T73 in grossular](https://digitalgemology.com/gemstones/grossular/triangle#con-leak) 41 vs 5 - [Less fire in grossular than in diamond](https://digitalgemology.com/gemstones/grossular/triangle#con-fire) 70 vs 86 Compared with the T73 Round Brilliant in grossular and with the Triangle 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](https://digitalgemology.com/about/how-we-measure). ## All eight scores against the T73 At a glance: the Triangle Cut in grossular (white) against the T73 Round Brilliant in grossular (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 grossular: ahead on 3, level on 1, behind on 4. - Global 60, the comparison 83, difference −23 - Brilliance 33, the comparison 94, difference −61 - Fire 70, the comparison 58, difference +12 - Scintillation 34, the comparison 80, difference −46 - Spread 104, the comparison 100, difference +4 - Symmetry 100, the comparison 100, difference 0 - Shape-norm 43, the comparison 101, difference −58 - Tilt 100, the comparison 74, difference +26 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](https://digitalgemology.com/tools/cut-performance-wheel?cut=triangle&stone=grossular); these are the same census figures as our [Cut Performance Index](https://digitalgemology.com/learn/cut-performance-index). ## What the Triangle Cut gains in grossular Against the T73 in grossular and the same cut in diamond, no figure of the Triangle Cut is ahead by the thresholds above. Its figures are in the wheel and the FAQ; [Grossular](https://digitalgemology.com/gemstones/grossular) ranks every cut we score in grossular. ## What the Triangle Cut gives up in grossular ### Returns less light than the T73 in grossular **Brilliance 33** against 94 for the T73 Round Brilliant in grossular: 61 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 grossular, whose critical angle is 35.3°, the Triangle Cut returns 33 of 100 and the T73 94. The Triangle Cut's pavilion mains sit at 41.8°, the T73's at 40.8°. The maps below show where each stone's light returns from and where it leaks. Triangle Cut in grossular · Brilliance 33 T73 Round Brilliant in grossular · Brilliance 94 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](https://digitalgemology.com/gemstones/grossular/dg-m5) reads 100 for brilliance in grossular, the best of the cuts we score there. [Try it yourself: Open this Light Return map in the simulator](https://digitalgemology.com/tools/3d_gemstone_simulator?cut=triangle&stone=grossular&ct=1.00&view=up&map=1&turn=0) ### Fewer facets, less sparkle **Scintillation 34** against 80 for the T73 Round Brilliant in grossular: 46 points lower Scintillation follows the number of facets the stone shows: 100 × (1 − e^(−facets / 45)). The Triangle Cut has 19 facets and the T73 73, so 34 against 80. It depends on the geometry alone, so it is the same in every stone. *Facet diagram of the Triangle Cut: its crown, seen face-up, 19 facets in all* Triangle Cut · 19 facets · Scintillation 34 *Facet diagram of the T73 Round Brilliant: its crown, seen face-up, 73 facets in all* T73 Round Brilliant · 73 facets · Scintillation 80 Scintillation follows the number of facets: more facets, more and smaller flashes as the stone moves. Compare the facet counts under the drawings; each drawing shows only the crown. Drawn from each cut's own model. **What helps:** [the DG-Miliano](https://digitalgemology.com/gemstones/grossular/dg-miliano) reads 98 for scintillation in grossular, the best of the cuts we score there. [Try it yourself: Compare the Scintillation spoke in the Cut Performance Wheel](https://digitalgemology.com/tools/cut-performance-wheel?cut=triangle&stone=grossular) ### Leaks more light than the T73 in grossular **Leakage 41** against 5 for the T73 Round Brilliant in grossular: 36 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 Triangle Cut leaks 41% in grossular against 5% for the T73 in grossular. Grey in the maps below is leaking light; the share under each picture is that picture's own. Triangle Cut in grossular · Leakage 41 0° · 41% leak 10° · 32% leak 20° · 39% leak 30° · 33% leak T73 Round Brilliant in grossular · Leakage 5 0° · 0% leak 10° · 14% leak 20° · 28% leak 30° · 31% leak 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. **What helps:** [the DG-M5](https://digitalgemology.com/gemstones/grossular/dg-m5) reads 0% for leakage in grossular, the best of the cuts we score there. [Try it yourself: Tilt it yourself in the simulator's light map](https://digitalgemology.com/tools/3d_gemstone_simulator?cut=triangle&stone=grossular&ct=1.00&view=up&map=1&turn=0) ### Less fire in grossular than in diamond **Fire 70** against 86 for the Triangle Cut in diamond: 16 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 (0.024 in grossular) and counts a ray as fire when the two directions differ by more than 0.6°. The Triangle Cut reads 70 against 86 for the same cut in diamond. The figure is the census's; the 3D Gemstone Simulator renders grossular'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](https://digitalgemology.com/tools/3d_gemstone_simulator?cut=triangle&stone=grossular&ct=1.00&view=up&lighting=sun&turn=0): the Triangle Cut in grossular under the sunny-day lighting. **What helps:** [the DG-Elongated Hexagon](https://digitalgemology.com/gemstones/grossular/dg-elongated-hexagon) reads 90 for fire in grossular, the best of the cuts we score there. [Try it yourself: See the fire in the 3D Gemstone Simulator](https://digitalgemology.com/tools/3d_gemstone_simulator?cut=triangle&stone=grossular&ct=1.00&view=up&lighting=sun&turn=0) ## Our verdict on the Triangle Cut in grossular Against the T73 in grossular and the same cut in diamond, no figure of the Triangle Cut is ahead by our thresholds. The catch: it returns less light than the T73, has fewer facets to sparkle with, leaks more light than the T73 and shows less fire than in diamond. If that catch matters more to you, [the DG-M5](https://digitalgemology.com/gemstones/grossular/dg-m5) reads 100 for brilliance in grossular, 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 Triangle Cut model we traced. ## Triangle Cut Grossular: questions ### Is the Triangle a good cut for grossular? In our census the Triangle Cut returns 33 of 100 for brilliance and 70 for fire in grossular, against 94 and 58 for the T73 in the same stone. Against that round and against the same cut in diamond it has 0 pros and 4 cons by our thresholds; the summary above names them. ### What pavilion angle does grossular need? At least 36.2° for a round design: grossular's critical angle is 35.3°, 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 Triangle Cut's pavilion mains sit at 41.8°. ### How much does a Triangle weigh in grossular? At 6.5 mm across, 0.82 ct in grossular, against 0.79 ct for the same cut in diamond (+3%): grossular's specific gravity is 3.64, diamond's 3.52. ### Can I see the Triangle in grossular in 3D? Yes: the 3D Gemstone Simulator renders it live, with grossular's own refractive index and dispersion. Grossular 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 Triangle Cut files *6 formats* *Millimeters* *Watertight* ### Triangle Cut 3D files The Triangle Cut as exact geometry: 19 planar facets, real-world scale, ready for CAD, rendering, printing and casting. - **STEP** Exact faceted solid for CAD - **3DM** Rhino, closed mesh on its own layer - **STL** Watertight mesh for printing and casting - **OBJ** Mesh for modeling and rendering - **FBX** Blender, 3ds Max, Maya, Cinema 4D, Unity, Unreal - **GLB** Web, AR and quick previews €9.99 · [Personal use](https://digitalgemology.com/licence) [Buy the 3D files](https://digitalgemology.lemonsqueezy.com/checkout/buy/067c1e65-2a8c-46d7-a35b-b947713997ad) *GemCad* *96 index* ### Triangle Cut cutting files The Triangle Cut as a faceting design: 16 + 3 girdles = 19 facets, 96 index, 3-fold symmetry, ready for the machine. - **.asc** GemCad design file, 96 index gear - **.csv** Tier table: angles, indices and cutting order - **Diagram** Printable faceting diagram €6.99 · [Personal use](https://digitalgemology.com/licence) [Buy the cutting files](https://digitalgemology.lemonsqueezy.com/checkout/buy/eb7ee7ef-90f9-4c80-bcb3-5f289658d26b) Not sure the files open in your software? [Get the cube free](https://digitalgemology.lemonsqueezy.com/checkout/buy/2d1ab55f-2bd6-4897-a4cd-f3320f54e99e): the same six formats, for your email address, used only to send them ([privacy](https://digitalgemology.com/privacy#free-sample)). Questions before you buy? [Email us](mailto:support@digitalgemology.com). ## More gemstones and cuts [Grossular: optical properties and the top ten cuts](https://digitalgemology.com/gemstones/grossular) · [The Triangle Cut: specifications, model and files](https://digitalgemology.com/cuts/triangle) ### Other cuts in grossular - [T73 Round Brilliant](https://digitalgemology.com/gemstones/grossular/t73-round-brilliant) - [T105 Round Brilliant](https://digitalgemology.com/gemstones/grossular/t105-round-brilliant) - [DG-Vitruvio](https://digitalgemology.com/gemstones/grossular/dg-vitruvio) - [DG-Anteros](https://digitalgemology.com/gemstones/grossular/dg-anteros) - [DG-Broken Hearts and Arrows](https://digitalgemology.com/gemstones/grossular/dg-broken-hearts-and-arrows) - [Baguette Cut](https://digitalgemology.com/gemstones/grossular/baguette) - [Emerald Cut](https://digitalgemology.com/gemstones/grossular/emerald-cut) - [Marquise Cut](https://digitalgemology.com/gemstones/grossular/marquise) - [Oval Cut](https://digitalgemology.com/gemstones/grossular/oval) - [Pear Cut](https://digitalgemology.com/gemstones/grossular/pear) - [Radiant Cut](https://digitalgemology.com/gemstones/grossular/radiant) - [Rectangle Cut](https://digitalgemology.com/gemstones/grossular/rectangle) - [Teardrop Cut](https://digitalgemology.com/gemstones/grossular/teardrop) - [Asscher Cut](https://digitalgemology.com/gemstones/grossular/asscher) - [Cushion Cut](https://digitalgemology.com/gemstones/grossular/cushion) - [Emerald Square Cut](https://digitalgemology.com/gemstones/grossular/emerald-square) - [Princess Cut](https://digitalgemology.com/gemstones/grossular/princess) - [Radiant Square Cut](https://digitalgemology.com/gemstones/grossular/radiant-square) - [Square Cut](https://digitalgemology.com/gemstones/grossular/square) - [Trilliant Cut](https://digitalgemology.com/gemstones/grossular/trilliant) - [Trillion Cut](https://digitalgemology.com/gemstones/grossular/trillion) - [Hexagon Cut](https://digitalgemology.com/gemstones/grossular/hexagon) - [Octagon Cut](https://digitalgemology.com/gemstones/grossular/octagon) - [Portuguese Bird's Nest Cut](https://digitalgemology.com/gemstones/grossular/portuguese-birds-nest) - [Old Single Cut](https://digitalgemology.com/gemstones/grossular/old-single) - [Mazarin Cut](https://digitalgemology.com/gemstones/grossular/mazarin) - [Peruzzi Cut](https://digitalgemology.com/gemstones/grossular/peruzzi) - [Old Mine Cut](https://digitalgemology.com/gemstones/grossular/old-mine) - [Old European Cut](https://digitalgemology.com/gemstones/grossular/old-european) - [T57 Round Brilliant](https://digitalgemology.com/gemstones/grossular/t57-round-brilliant) - [DG-M5](https://digitalgemology.com/gemstones/grossular/dg-m5) - [DG-Miliano](https://digitalgemology.com/gemstones/grossular/dg-miliano) - [DG-Rafaello](https://digitalgemology.com/gemstones/grossular/dg-rafaello) - [DG-Bowtie](https://digitalgemology.com/gemstones/grossular/dg-bowtie) - [DG-Elongated Hexagon](https://digitalgemology.com/gemstones/grossular/dg-elongated-hexagon) - [DG-Octagonal Kite](https://digitalgemology.com/gemstones/grossular/dg-octagonal-kite) ### The Triangle Cut in other gemstones - [Diamond](https://digitalgemology.com/gemstones/diamond/triangle) - [Moissanite](https://digitalgemology.com/gemstones/moissanite/triangle) - [Cubic Zirconia](https://digitalgemology.com/gemstones/cubic-zirconia/triangle) - [Ruby](https://digitalgemology.com/gemstones/ruby/triangle) - [Sapphire](https://digitalgemology.com/gemstones/sapphire/triangle) - [Emerald](https://digitalgemology.com/gemstones/emerald/triangle) - [Amethyst](https://digitalgemology.com/gemstones/amethyst/triangle) - [Topaz](https://digitalgemology.com/gemstones/topaz/triangle) - [Spinel](https://digitalgemology.com/gemstones/spinel/triangle) - [Demantoid](https://digitalgemology.com/gemstones/demantoid/triangle) - [Zircon](https://digitalgemology.com/gemstones/zircon/triangle) - [Tourmaline](https://digitalgemology.com/gemstones/tourmaline/triangle) - [Peridot](https://digitalgemology.com/gemstones/peridot/triangle) - [Tanzanite](https://digitalgemology.com/gemstones/tanzanite/triangle) - [YAG](https://digitalgemology.com/gemstones/yag/triangle) - [Pyrope](https://digitalgemology.com/gemstones/pyrope/triangle) - [Almandine](https://digitalgemology.com/gemstones/almandine/triangle) - [Spessartine](https://digitalgemology.com/gemstones/spessartine/triangle) - [Chrysoberyl](https://digitalgemology.com/gemstones/chrysoberyl/triangle) - [Kunzite](https://digitalgemology.com/gemstones/kunzite/triangle) - [Iolite](https://digitalgemology.com/gemstones/iolite/triangle) - [Morganite](https://digitalgemology.com/gemstones/morganite/triangle) - [GGG](https://digitalgemology.com/gemstones/ggg/triangle) - [Strontium titanate](https://digitalgemology.com/gemstones/strontium-titanate/triangle) - [Synthetic rutile](https://digitalgemology.com/gemstones/synthetic-rutile/triangle)