---
title: "T57 Round Brilliant Chrysoberyl: Pros, Cons and Scores"
description: "T57 Round Brilliant in chrysoberyl: brilliance 94, fire 31, leakage 6%, 1 pro and 4 cons against the T73, from our ray-traced light census."
url: https://digitalgemology.com/gemstones/chrysoberyl/t57-round-brilliant
image: https://digitalgemology.com/img/stone-cuts/t57-round-brilliant-chrysoberyl-og.jpg?v=feb2019a
---

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# T57 Round Brilliant Chrysoberyl: faces up larger for its weight

**Buy (instant download, personal-use license):** [T57 Round Brilliant Cut 3D files, €9.99 · Personal use](https://digitalgemology.lemonsqueezy.com/checkout/buy/6818fad8-a74d-4c41-80a7-dfc92d1f6b11) · [T57 Round Brilliant Cut cutting files, €6.99 · Personal use](https://digitalgemology.lemonsqueezy.com/checkout/buy/ac539570-4805-4645-af3f-8cf47ba6b593) · [Buy the bundle](https://digitalgemology.lemonsqueezy.com/checkout/buy/dcf2c236-6e04-4292-8040-9d21ac6446d1?checkout%5Bdiscount_code%5D=HISTORIC25) · [Get the cube free](https://digitalgemology.lemonsqueezy.com/checkout/buy/2d1ab55f-2bd6-4897-a4cd-f3320f54e99e)

Brilliance 94 · Fire 31 · Scintillation 72 · in our census, where the T73 scores 94 · 29 · 80 in chrysoberyl

How the T57 Round Brilliant handles light in chrysoberyl, measured: brilliance 94, fire 31 and 6% leakage, set against the T73 in the same stone and against the same cut in diamond.

[Get the files](https://digitalgemology.com/gemstones/chrysoberyl/t57-round-brilliant#buy) [Open it in the Simulator](https://digitalgemology.com/tools/3d_gemstone_simulator?cut=t57-round-brilliant&stone=chrysoberyl&ct=1.00&view=angle&lighting=studio&turn=0) [All cuts in chrysoberyl](https://digitalgemology.com/gemstones/chrysoberyl)

Light Return map of the T57 Round Brilliant in chrysoberyl, face-up, from our own tracer at refractive index 1.746. Red, green and blue return light to the eye; gray leaks.

## T57 Round Brilliant Chrysoberyl

Chrysoberyl has a refractive index of 1.746 to 1.755 and a dispersion of 0.015. Its critical angle, from the low end of that range, is 34.9°, so a round design needs a pavilion of at least 36.3° for head-on light to reflect off both sides of the pavilion and leave through the table. We trace it with one index, 1.751, the midpoint of the published range, and a fire spread of 0.013, 0.86 of the published dispersion. Every picture here is our Light Return tracer at 1.746, and every figure is from the same light census that scores the other gemstones; the 3D Gemstone Simulator shows the T57 Round Brilliant in chrysoberyl live.

The T57 Round Brilliant has 57 facets and a total depth of 59.2% of its width; its pavilion mains sit at 40.8°. In chrysoberyl, the census returns 94 of 100 for brilliance and 31 for fire, against 94 and 29 for the T73, our benchmark, in the same stone; the same T57 Round Brilliant in diamond reads 92 and 79.

## Is chrysoberyl good in a T57? Pros and cons, measured

### Pros

- [Faces up larger for its weight](https://digitalgemology.com/gemstones/chrysoberyl/t57-round-brilliant#pro-faceup) 107 vs 100

### Cons

- [Less fire in chrysoberyl than in diamond](https://digitalgemology.com/gemstones/chrysoberyl/t57-round-brilliant#con-fire) 31 vs 79
- [Loses more light when tilted than in diamond](https://digitalgemology.com/gemstones/chrysoberyl/t57-round-brilliant#con-tiltStab) 73 vs 90
- [Fewer facets, less sparkle](https://digitalgemology.com/gemstones/chrysoberyl/t57-round-brilliant#con-scint) 72 vs 80
- [Heavier than the same cut in diamond](https://digitalgemology.com/gemstones/chrysoberyl/t57-round-brilliant#con-weight) 0.97 vs 0.92 ct

Compared with the T73 Round Brilliant in chrysoberyl and with the T57 Round Brilliant 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 T57 Round Brilliant in chrysoberyl (white) against the T73 Round Brilliant in chrysoberyl (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 chrysoberyl: ahead on 2, level on 3, behind on 3.

- Global 76, the comparison 77, difference −1
- Brilliance 94, the comparison 94, difference 0
- Fire 31, the comparison 29, difference +2
- Scintillation 72, the comparison 80, difference −8
- Spread 101, the comparison 100, difference +1
- Symmetry 100, the comparison 100, difference 0
- Shape-norm 101, the comparison 101, difference 0
- Tilt 73, the comparison 75, difference −2

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=t57-round-brilliant&stone=chrysoberyl); these are the same census figures as our [Cut Performance Index](https://digitalgemology.com/learn/cut-performance-index).

## What the T57 Round Brilliant gains in chrysoberyl

### Faces up larger for its weight

**Face-up size 107** against 100 for the T73 Round Brilliant in chrysoberyl (T73 = 100): 7% more face-up area for the same weight

Face-up size is the outline's area per carat, measured from each model (T73 = 100): 107 for the T57 Round Brilliant 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.

*Face-up outline of the T57 Round Brilliant at 1.00 ct in chrysoberyl: 6.56 mm, drawn to scale*

T57 Round Brilliant · 6.56 mm at 1.00 ct · Face-up size 107

*Face-up outline of the T73 Round Brilliant at 1.00 ct in chrysoberyl: 6.36 mm, drawn to scale*

T73 Round Brilliant · 6.36 mm at 1.00 ct · Face-up size 100

Both stones weigh 1.00 ct in chrysoberyl and are drawn to the same scale in millimeters, from each cut's own model. Face-up size is the outline's area per carat, with the T73 at 100: a deeper stone, or a rounder outline, spreads less area for its weight.

[Try it yourself: See its size at 1.00 ct in chrysoberyl in the 3D Gemstone Simulator](https://digitalgemology.com/tools/3d_gemstone_simulator?cut=t57-round-brilliant&stone=chrysoberyl&ct=1.00&view=up&lighting=studio&turn=0)

## What the T57 Round Brilliant gives up in chrysoberyl

### Less fire in chrysoberyl than in diamond

**Fire 31** against 79 for the T57 Round Brilliant in diamond: 48 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 (0.013 in chrysoberyl) and counts a ray as fire when the two directions differ by more than 0.6°. The T57 Round Brilliant reads 31 against 79 for the same cut in diamond. The figure is the census's; the 3D Gemstone Simulator renders chrysoberyl'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=t57-round-brilliant&stone=chrysoberyl&ct=1.00&view=up&lighting=sun&turn=0): the T57 Round Brilliant in chrysoberyl under the sunny-day lighting.

**What helps:** [the Oval Cut](https://digitalgemology.com/gemstones/chrysoberyl/oval) reads 67 for fire in chrysoberyl, 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=t57-round-brilliant&stone=chrysoberyl&ct=1.00&view=up&lighting=sun&turn=0)

### Loses more light when tilted than in diamond

**Tilt 73** against 90 for the T57 Round Brilliant in diamond: 17 points lower

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 T57 Round Brilliant keeps 73 against 90 for the same cut in diamond. The tilt strips below show the maps at 0°, 10°, 20° and 30°, with each picture's own leak share under it.

T57 Round Brilliant in chrysoberyl · Tilt 73

0° · 1% leak

10° · 11% leak

20° · 28% leak

30° · 29% leak

T57 Round Brilliant in diamond · Tilt 90

0° · 4% leak

10° · 2% leak

20° · 10% leak

30° · 16% 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.

**What helps:** [the DG-Miliano](https://digitalgemology.com/gemstones/chrysoberyl/dg-miliano) reads 83 for tilt in chrysoberyl, the best of the cuts we score there.

[Try it yourself: Compare the Tilt spoke in the Cut Performance Wheel](https://digitalgemology.com/tools/cut-performance-wheel?cut=t57-round-brilliant&stone=chrysoberyl&vs=t57-round-brilliant&vsstone=diamond)

### Fewer facets, less sparkle

**Scintillation 72** against 80 for the T73 Round Brilliant in chrysoberyl: 8 points lower

Scintillation follows the number of facets the stone shows: 100 × (1 − e^(−facets / 45)). The T57 Round Brilliant has 57 facets and the T73 73, so 72 against 80. It depends on the geometry alone, so it is the same in every stone.

*Facet diagram of the T57 Round Brilliant: its crown, seen face-up, 57 facets in all*

T57 Round Brilliant · 57 facets · Scintillation 72

*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/chrysoberyl/dg-miliano) reads 98 for scintillation in chrysoberyl, 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=t57-round-brilliant&stone=chrysoberyl)

### Heavier than the same cut in diamond

**0.97 ct** at 6.5 mm, against 0.92 ct for the same cut in diamond (+6%)

Weight follows specific gravity: 3.73 for chrysoberyl against 3.52 for diamond, so the same model at the same size weighs 0.97 ct here and 0.92 ct in diamond, 6.5 mm across. Nothing about the light changes with it.

*Weight of a 6.5 mm T57 Round Brilliant: 0.97 ct in chrysoberyl, 0.92 ct in diamond*

A T57 Round Brilliant 6.5 mm across, weighed from the model's measured volume and each stone's specific gravity.

[Try it yourself: Weights in every gemstone on the T57 Round Brilliant page](https://digitalgemology.com/cuts/t57-round-brilliant#stones)

## Our verdict on the T57 Round Brilliant in chrysoberyl

Pick the T57 Round Brilliant in chrysoberyl for this: it faces up larger for its weight. The catch: it shows less fire than in diamond, loses more light when tilted than in diamond, has fewer facets to sparkle with and weighs more than in diamond.

If that catch matters more to you, [the Oval Cut](https://digitalgemology.com/gemstones/chrysoberyl/oval) reads 67 for fire in chrysoberyl, 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 T57 Round Brilliant model we traced.

## T57 Round Brilliant Chrysoberyl: questions

### Is the T57 a good cut for chrysoberyl?

In our census the T57 Round Brilliant returns 94 of 100 for brilliance and 31 for fire in chrysoberyl, against 94 and 29 for the T73 in the same stone. Against that round and against the same cut in diamond it has 1 pro and 4 cons by our thresholds; the summary above names them.

### What pavilion angle does chrysoberyl need?

At least 36.3° for a round design: chrysoberyl's critical angle is 34.9°, 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 T57 Round Brilliant's pavilion mains sit at 40.8°.

### How much does a T57 weigh in chrysoberyl?

At 6.5 mm across, 0.97 ct in chrysoberyl, against 0.92 ct for the same cut in diamond (+6%): chrysoberyl's specific gravity is 3.73, diamond's 3.52.

### Can I see the T57 in chrysoberyl in 3D?

Yes: the 3D Gemstone Simulator renders it live, with chrysoberyl's own refractive index and dispersion. Chrysoberyl 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 T57 Round Brilliant Cut files

*6 formats* *Millimeters* *Watertight*

### T57 Round Brilliant Cut 3D files

The T57 Round Brilliant Cut as exact geometry: 57 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/6818fad8-a74d-4c41-80a7-dfc92d1f6b11)

*GemCad* *96 index*

### T57 Round Brilliant Cut cutting files

The T57 Round Brilliant Cut as a faceting design: 57 facets, 96 index, 8-fold mirror-image 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/ac539570-4805-4645-af3f-8cf47ba6b593)

Save with a bundle: the T57 Round Brilliant Cut 3D and cutting files are also in [Historic Cuts Complete](https://digitalgemology.com/cuts/#bundles), 6 cuts for €29.99 until 1 December, then €39.99 (€101.88 as single files). [Buy the bundle](https://digitalgemology.lemonsqueezy.com/checkout/buy/dcf2c236-6e04-4292-8040-9d21ac6446d1?checkout%5Bdiscount_code%5D=HISTORIC25).

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

[Chrysoberyl: optical properties and the top ten cuts](https://digitalgemology.com/gemstones/chrysoberyl) · [The T57 Round Brilliant: specifications, model and files](https://digitalgemology.com/cuts/t57-round-brilliant)

### Other cuts in chrysoberyl

- [T73 Round Brilliant](https://digitalgemology.com/gemstones/chrysoberyl/t73-round-brilliant)
- [T105 Round Brilliant](https://digitalgemology.com/gemstones/chrysoberyl/t105-round-brilliant)
- [DG-Vitruvio](https://digitalgemology.com/gemstones/chrysoberyl/dg-vitruvio)
- [DG-Anteros](https://digitalgemology.com/gemstones/chrysoberyl/dg-anteros)
- [DG-Broken Hearts and Arrows](https://digitalgemology.com/gemstones/chrysoberyl/dg-broken-hearts-and-arrows)
- [Baguette Cut](https://digitalgemology.com/gemstones/chrysoberyl/baguette)
- [Emerald Cut](https://digitalgemology.com/gemstones/chrysoberyl/emerald-cut)
- [Marquise Cut](https://digitalgemology.com/gemstones/chrysoberyl/marquise)
- [Oval Cut](https://digitalgemology.com/gemstones/chrysoberyl/oval)
- [Pear Cut](https://digitalgemology.com/gemstones/chrysoberyl/pear)
- [Radiant Cut](https://digitalgemology.com/gemstones/chrysoberyl/radiant)
- [Rectangle Cut](https://digitalgemology.com/gemstones/chrysoberyl/rectangle)
- [Teardrop Cut](https://digitalgemology.com/gemstones/chrysoberyl/teardrop)
- [Asscher Cut](https://digitalgemology.com/gemstones/chrysoberyl/asscher)
- [Cushion Cut](https://digitalgemology.com/gemstones/chrysoberyl/cushion)
- [Emerald Square Cut](https://digitalgemology.com/gemstones/chrysoberyl/emerald-square)
- [Princess Cut](https://digitalgemology.com/gemstones/chrysoberyl/princess)
- [Radiant Square Cut](https://digitalgemology.com/gemstones/chrysoberyl/radiant-square)
- [Square Cut](https://digitalgemology.com/gemstones/chrysoberyl/square)
- [Triangle Cut](https://digitalgemology.com/gemstones/chrysoberyl/triangle)
- [Trilliant Cut](https://digitalgemology.com/gemstones/chrysoberyl/trilliant)
- [Trillion Cut](https://digitalgemology.com/gemstones/chrysoberyl/trillion)
- [Hexagon Cut](https://digitalgemology.com/gemstones/chrysoberyl/hexagon)
- [Octagon Cut](https://digitalgemology.com/gemstones/chrysoberyl/octagon)
- [Portuguese Bird's Nest Cut](https://digitalgemology.com/gemstones/chrysoberyl/portuguese-birds-nest)
- [Old Single Cut](https://digitalgemology.com/gemstones/chrysoberyl/old-single)
- [Mazarin Cut](https://digitalgemology.com/gemstones/chrysoberyl/mazarin)
- [Peruzzi Cut](https://digitalgemology.com/gemstones/chrysoberyl/peruzzi)
- [Old Mine Cut](https://digitalgemology.com/gemstones/chrysoberyl/old-mine)
- [Old European Cut](https://digitalgemology.com/gemstones/chrysoberyl/old-european)
- [DG-M5](https://digitalgemology.com/gemstones/chrysoberyl/dg-m5)
- [DG-Miliano](https://digitalgemology.com/gemstones/chrysoberyl/dg-miliano)
- [DG-Rafaello](https://digitalgemology.com/gemstones/chrysoberyl/dg-rafaello)
- [DG-Bowtie](https://digitalgemology.com/gemstones/chrysoberyl/dg-bowtie)
- [DG-Elongated Hexagon](https://digitalgemology.com/gemstones/chrysoberyl/dg-elongated-hexagon)
- [DG-Octagonal Kite](https://digitalgemology.com/gemstones/chrysoberyl/dg-octagonal-kite)

### The T57 Round Brilliant in other gemstones

- [Diamond](https://digitalgemology.com/gemstones/diamond/t57-round-brilliant)
- [Moissanite](https://digitalgemology.com/gemstones/moissanite/t57-round-brilliant)
- [Cubic Zirconia](https://digitalgemology.com/gemstones/cubic-zirconia/t57-round-brilliant)
- [Ruby](https://digitalgemology.com/gemstones/ruby/t57-round-brilliant)
- [Sapphire](https://digitalgemology.com/gemstones/sapphire/t57-round-brilliant)
- [Emerald](https://digitalgemology.com/gemstones/emerald/t57-round-brilliant)
- [Amethyst](https://digitalgemology.com/gemstones/amethyst/t57-round-brilliant)
- [Topaz](https://digitalgemology.com/gemstones/topaz/t57-round-brilliant)
- [Spinel](https://digitalgemology.com/gemstones/spinel/t57-round-brilliant)
- [Demantoid](https://digitalgemology.com/gemstones/demantoid/t57-round-brilliant)
- [Zircon](https://digitalgemology.com/gemstones/zircon/t57-round-brilliant)
- [Tourmaline](https://digitalgemology.com/gemstones/tourmaline/t57-round-brilliant)
- [Peridot](https://digitalgemology.com/gemstones/peridot/t57-round-brilliant)
- [Tanzanite](https://digitalgemology.com/gemstones/tanzanite/t57-round-brilliant)
- [YAG](https://digitalgemology.com/gemstones/yag/t57-round-brilliant)
- [Pyrope](https://digitalgemology.com/gemstones/pyrope/t57-round-brilliant)
- [Almandine](https://digitalgemology.com/gemstones/almandine/t57-round-brilliant)
- [Spessartine](https://digitalgemology.com/gemstones/spessartine/t57-round-brilliant)
- [Grossular](https://digitalgemology.com/gemstones/grossular/t57-round-brilliant)
- [Kunzite](https://digitalgemology.com/gemstones/kunzite/t57-round-brilliant)
- [Iolite](https://digitalgemology.com/gemstones/iolite/t57-round-brilliant)
- [Morganite](https://digitalgemology.com/gemstones/morganite/t57-round-brilliant)
- [GGG](https://digitalgemology.com/gemstones/ggg/t57-round-brilliant)
- [Strontium titanate](https://digitalgemology.com/gemstones/strontium-titanate/t57-round-brilliant)
- [Synthetic rutile](https://digitalgemology.com/gemstones/synthetic-rutile/t57-round-brilliant)