DG-Anteros Cut: 3D Model & Faceting Diagram

About the DG-Anteros Cut

DG-Anteros is a 73-facet round brilliant re-solved for moissanite. It keeps the T73's architecture and 53% table, but it eases the crown and shifts the pavilion cone. This is because moissanite bends light more strongly than diamond, the stone that the 1919 proportions were calculated for.

In moissanite it forms crisp arrows face-up and eight clean hearts face-down. A round with diamond proportions does not. It is matched to its material, not better in general: in diamond its arrows turn dark and its hearts flood. The comparison is on the gemstones page.

Why DG-Anteros: a round cut for moissanite

Most moissanite is cut to diamond proportions. But moissanite bends light more strongly than diamond: its refractive index is about 2.65, and diamond's is 2.42. So angles calculated for diamond send its light back at the wrong angles. The patterns that make a well-cut round special break up: eight crisp arrows face-up and eight hearts face-down.

DG-Anteros keeps the T73's 73 facets and 53% table and re-solves the crown and pavilion for moissanite. Here is the difference, in both stones, through a light-return scope and a Hearts & Arrows viewer.

DiamondRI 2.417

MoissaniteRI 2.648

T73

T73 in diamond: face-up Light Return map — **T73 in diamond.** Crisp arrows and crisp hearts: the proportions were worked out for diamond.

T73 in diamond through a Hearts and Arrows viewer, face-up: the arrows — **T73 in diamond.** Crisp arrows and crisp hearts: the proportions were worked out for diamond.

T73 in moissanite: face-up Light Return map — **T73 in moissanite.** Both patterns break up. The same angles bend moissanite's light too far.

T73 in moissanite through a Hearts and Arrows viewer, face-up: the arrows — **T73 in moissanite.** Both patterns break up. The same angles bend moissanite's light too far.

DG-Anteros

DG-Anteros in moissanite: face-up Light Return map — **DG-Anteros in moissanite.** Crisp arrows and eight clean hearts: the cut it was drawn for.

DG-Anteros in moissanite through a Hearts and Arrows viewer, face-up: the arrows — **DG-Anteros in moissanite.** Crisp arrows and eight clean hearts: the cut it was drawn for.

Direct Indirect Contrast Leak. Face-up, the way a light-return scope shows a stone.

White: light from the viewer's white disk, which draws the arrows and hearts. Red: light from the red reflector. Black: the lens port, or light that never comes back.

We compute all eight panels per instrument from the cut files themselves, with the same rules for every stone. The Hearts & Arrows viewer has a 2.5° lens hole, a white disk to 13.5° and a red reflector to 90°.

What this means for you

Cutting or selling moissanite: DG-Anteros is the only cut in our catalog that shows both arrows and hearts in moissanite. A round with diamond proportions, like the T73, loses both.
Cutting diamond: choose the T73 instead. DG-Anteros is matched to moissanite, not better in general. In diamond, its arrows go dark and its hearts flood.
Nothing new to learn at the machine: it has the same 73-facet plan on a 96 index gear as the T73. Only the angles change.
Everything you need: the GemCad design, the tier table and a printable diagram, plus the 3D model in six formats for settings and renders.

Get the DG-Anteros files Moissanite in detail

DG-Anteros Cut specifications

Measured from the delivered model, not quoted from a standard.

CategoryBrilliants

Facets73 planar facets (57 + 16 girdles = 73)

OutlineLength to width 1.000

Total depth59.4% of width

Table53.5% of width

Crown angle (main)33.0°

Pavilion angle (main)40.1°

Reference size8.15 x 8.15 x 4.84 mm at 1.91 ct in diamond

Volume108.58 mm³

Cutting file accuracyEvery crown and pavilion facet within under 0.001° of the 3D model (average under 0.001°)

Index gear96

Symmetry8-fold mirror-image symmetry

Tiers3 crown, 2 pavilion

FilesSTEP, 3DM, STL, OBJ, FBX, GLB, GemCad .asc, tier table, diagram

Face-up and profile

Face-up: the crown facets, drawn from the model's own edges.

Profile: 59.4% total depth.

Light Return map of the DG-Anteros Cut in moissanite: a computed render showing direct, indirect and contrast light across the face-up stone. — Light Return map of the DG-Anteros Cut in moissanite. A computed render of the model's geometry, not a photograph.

Cut Performance Index

Diamond 88.4 overall, 8th of 37
Moissanite 90.9 overall, 8th of 37
Cubic Zirconia 89.0 overall, 9th of 37
Ruby 81.7 overall, 2nd of 37
Sapphire 81.7 overall, 2nd of 37
Emerald 77.3 overall, 2nd of 37
Amethyst 75.7 overall, 2nd of 37

Also scored in 19 more gemstones

Topaz 79.0 overall, 2nd of 37
Spinel 83.6 overall, 2nd of 37
Demantoid 88.8 overall, 8th of 37
Zircon 86.2 overall, 8th of 37
Tourmaline 81.1 overall, 2nd of 37
Peridot 83.6 overall, joint 1st of 37
Tanzanite 83.1 overall, 1st of 37
YAG 85.1 overall, joint 2nd of 37
Pyrope 84.4 overall, 2nd of 37
Almandine 85.6 overall, 2nd of 37
Spessartine 85.3 overall, 2nd of 37
Grossular 86.5 overall, 2nd of 37
Chrysoberyl 80.5 overall, 2nd of 37
Kunzite 82.1 overall, 1st of 37
Iolite 78.3 overall, 1st of 37
Morganite 77.7 overall, 2nd of 37
GGG 87.2 overall, 8th of 37
Strontium titanate 92.5 overall, joint 9th of 37
Synthetic rutile 91.1 overall, 3rd of 37

See how every cut compares

How the DG-Anteros Cut performs in seven gemstones

The DG-Anteros Cut was drawn for moissanite, and it performs best in that stone. Its brilliance and fire together are highest there: 92 for brilliance and 91 for fire. Its brilliance peaks in ruby and sapphire, at 97. In diamond it scores 95 for brilliance and 74 for fire, against 93 and 78 for the T73 benchmark. Its scintillation, 80, comes from its pattern of facets, so it is the same in every stone.

Brilliance, fire and scintillation of the DG-Anteros Cut in seven gemstones, out of 100, with the T73 Round Brilliant benchmark in each
Gemstone	Brilliance	Fire	Scintillation
Diamond	95 (T73 benchmark 93)	74 (T73 benchmark 78)	80 (T73 benchmark 80)
MoissaniteBest overallHighest fire	92 (T73 benchmark 86)	91 (T73 benchmark 97)	80 (T73 benchmark 80)
Cubic Zirconia	92 (T73 benchmark 98)	82 (T73 benchmark 87)	80 (T73 benchmark 80)
RubyHighest brilliance	97 (T73 benchmark 94)	43 (T73 benchmark 37)	80 (T73 benchmark 80)
SapphireHighest brilliance	97 (T73 benchmark 94)	43 (T73 benchmark 37)	80 (T73 benchmark 80)
Emerald	86 (T73 benchmark 78)	52 (T73 benchmark 39)	80 (T73 benchmark 80)
Amethyst	82 (T73 benchmark 72)	54 (T73 benchmark 36)	80 (T73 benchmark 80)

Score out of 100T73 Round Brilliant, our benchmark, in the same stoneBest overall: the highest brilliance and fire together

Brilliance is the share of face-up light that the stone returns. Fire is the share of that light that splits into color. Both come from our face-up light census. Scintillation is the sparkle that the facets give as the stone moves, and we read it from its facets. They are the same figures as the Cut Performance Wheel, where you can compare the DG-Anteros Cut with any other cut. A simulation of the geometry, not a grading report.

Also scored, with the same census, in 19 more gemstones: topaz, spinel, demantoid, zircon, tourmaline, peridot, tanzanite, YAG, pyrope, almandine, spessartine, grossular, chrysoberyl, kunzite, iolite, morganite, GGG, strontium titanate and synthetic rutile. Their head-on figures are in the table below.

Head-on reflection, critical angle and weight in each stone

The same geometry behaves differently in every material. Light that meets a pavilion facet at less than the critical angle of the stone does not reflect. It passes straight out of the back and shows face-up as a window. For each stone, we measured how much of the pavilion of this model, seen face-down, is steeper than that angle. We also measured what the model weighs at its reference size. The pavilion mains of this design sit at 40.1°. A round design needs at least 40.4° in amethyst for head-on light to reflect off both sides of the pavilion and leave through the table. So it is worth making the mains steeper for amethyst.

Head-on light in amethyst: a steep facet reflects it, a shallow facet lets it out of the back.

Stone	Refractive index	Critical angle	Pavilion reflecting head-on light	Weight at this size	Verdict
Diamond	2.417	24.4°	100%	1.91 ct	Holds head-on light
Moissanite	2.648 to 2.691	22.2°	100%	1.75 ct	Holds head-on light
Cubic Zirconia	2.15 to 2.18	27.7°	100%	3.15 ct	Holds head-on light
Ruby	1.762 to 1.770	34.6°	100%	2.17 ct	Holds head-on light
Sapphire	1.762 to 1.770	34.6°	100%	2.17 ct	Holds head-on light
Emerald	1.577 to 1.583	39.4°	100%	1.48 ct	Holds head-on light
Amethyst	1.544 to 1.553	40.4°	76%	1.44 ct	Steepen the pavilion
Topaz	1.606 to 1.644	38.5°	100%	1.92 ct	Holds head-on light
Spinel	1.712 to 1.747	35.7°	100%	1.97 ct	Holds head-on light
Demantoid	1.881 to 1.888	32.1°	100%	2.09 ct	Holds head-on light
Zircon	1.925 to 1.984	31.3°	100%	2.53 ct	Holds head-on light
Tourmaline	1.603 to 1.655	38.6°	100%	1.70 ct	Holds head-on light
Peridot	1.650 to 1.690	37.3°	100%	1.82 ct	Holds head-on light
Tanzanite	1.685 to 1.707	36.4°	100%	1.82 ct	Holds head-on light
YAG	1.833	33.1°	100%	2.47 ct	Holds head-on light
Pyrope	1.730 to 1.766	35.3°	100%	2.04 ct	Holds head-on light
Almandine	1.750 to 1.830	34.8°	100%	2.24 ct	Holds head-on light
Spessartine	1.790 to 1.830	34.0°	100%	2.26 ct	Holds head-on light
Grossular	1.730 to 1.760	35.3°	100%	1.98 ct	Holds head-on light
Chrysoberyl	1.746 to 1.755	34.9°	100%	2.03 ct	Holds head-on light
Kunzite	1.660 to 1.676	37.0°	100%	1.73 ct	Holds head-on light
Iolite	1.542 to 1.551	40.4°	76%	1.42 ct	Steepen the pavilion
Morganite	1.572 to 1.600	39.5°	100%	1.55 ct	Holds head-on light
GGG	1.970	30.5°	100%	3.83 ct	Holds head-on light
Strontium titanate	2.409	24.5°	100%	2.79 ct	Holds head-on light
Synthetic rutile	2.616 to 2.903	22.5°	100%	2.31 ct	Holds head-on light

Head-on light, first reflection. The 3D Gemstone Simulator traces the full Light Return in each of these gemstones.

Available in…

The DG-Anteros stone by stone: what each gemstone gains and loses in this cut, measured.

Grade the DG-Anteros Cut in 3D

Open it in the 3D Gemstone Simulator. Set its carat, color, clarity and cut grade in any of seven gemstones. Turn it under ten kinds of light, and watch its 3D gemstone report change as you go. Free, in your browser.

Open it in the Simulator

DG-Anteros Cut: questions

What files come with the DG-Anteros Cut 3D model?

Six formats. STEP is the exact faceted solid for CAD, and 3DM is for Rhino. STL and OBJ are meshes. FBX is for Blender, 3ds Max, Maya, Cinema 4D, Unity and Unreal. GLB is for the web and AR. All are in millimeters at real-world scale, with 73 planar facets.

Is there a faceting diagram for the DG-Anteros Cut?

Yes. The cutting files contain a GemCad .asc design (57 + 16 girdles = 73 facets, 96 index, 8-fold mirror-image symmetry) and a printable faceting diagram. They also contain a tier table in CSV, with the angles, indices and cutting order.

Does the DG-Anteros Cut work in sapphire, emerald or amethyst?

We measured the pavilion of this model against the critical angle of each stone. In Diamond, Moissanite, Cubic Zirconia, Ruby, Sapphire, Emerald, the whole pavilion reflects head-on light. In Amethyst, part of the pavilion lets light out of the back, so we advise a steeper pavilion. The pavilion mains of this design sit at 40.1°. A round design needs at least 40.4° in amethyst for head-on light to reflect off both sides of the pavilion and leave through the table. So it is worth making the mains steeper for amethyst.

How accurate is the DG-Anteros Cut cutting file?

We check it facet by facet against the 3D model that it was written from. Every crown and pavilion facet within under 0.001° of the 3D model (average under 0.001°). The angles are the ones you set on the machine. The 3D model is the same stone that you render or set.

How big is the DG-Anteros Cut model, and what does it weigh?

The model measures 8.15 x 8.15 x 4.84 mm, which is 1.91 ct in diamond. At the same size, it weighs 1.75 ct in moissanite, 3.15 ct in cubic zirconia, 2.17 ct in ruby, 2.17 ct in sapphire, 1.48 ct in emerald, 1.44 ct in amethyst. You can scale it uniformly to any size: the weight follows the cube of the size.

Twice the size holds eight times the material, so it weighs eight times as much.

Can I 3D print or cast the DG-Anteros Cut model?

Yes. The mesh is watertight and manifold, with outward normals and no duplicate vertices, so it prints and casts without repair. Use the STEP file when you need the exact faceted solid in CAD.