DG-Bowtie Cut: 3D Model & Faceting Diagram

About the DG-Bowtie Cut

DG-Bowtie is the first marquise of the library, a diamond design. When we remodeled the Marquise, we kept this design under its own name. It is nearly as deep as it is wide, but the trade aims for about 60%.

Face-up, it shows the bow-tie that elongated brilliants often have: a dark band across the middle of the stone. Study it beside the remodeled Marquise, or render it when you want to show a bow-tie.

DG-Bowtie Cut specifications

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

CategoryHouse cuts

Facets87 planar facets (67 + 20 girdles = 87)

OutlineLength to width 2.059

Total depth93.8% of width

Crown angle (main)49.0°

Pavilion angle (main)42.0°

Reference size10.65 x 5.17 x 4.85 mm at 1.59 ct in diamond

Volume90.22 mm³

Cutting file accuracyEvery crown and pavilion facet within 0.004° of the 3D model (average under 0.001°); girdle facets within 0.043°

Index gear64

Symmetry2-fold mirror-image symmetry

Tiers10 crown, 8 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: 93.8% total depth.

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

Cut Performance Index

Diamond 63.1 overall, 35th of 37
Moissanite 66.9 overall, 35th of 37
Cubic Zirconia 63.1 overall, 35th of 37
Ruby 55.0 overall, 34th of 37
Sapphire 55.0 overall, 34th of 37
Emerald 50.1 overall, 33rd of 37
Amethyst 48.6 overall, 33rd of 37

Also scored in 19 more gemstones

Topaz 50.1 overall, 34th of 37
Spinel 55.1 overall, 34th of 37
Demantoid 64.3 overall, 35th of 37
Zircon 62.0 overall, 35th of 37
Tourmaline 51.4 overall, 34th of 37
Peridot 54.3 overall, 34th of 37
Tanzanite 53.4 overall, 34th of 37
YAG 60.4 overall, 35th of 37
Pyrope 56.3 overall, 34th of 37
Almandine 58.7 overall, 35th of 37
Spessartine 59.2 overall, 35th of 37
Grossular 57.6 overall, 35th of 37
Chrysoberyl 54.0 overall, 34th of 37
Kunzite 53.4 overall, 34th of 37
Iolite 50.5 overall, 33rd of 37
Morganite 49.3 overall, joint 33rd of 37
GGG 63.0 overall, 35th of 37
Strontium titanate 66.2 overall, 35th of 37
Synthetic rutile 64.2 overall, 35th of 37

See how every cut compares

How the DG-Bowtie Cut performs in seven gemstones

The DG-Bowtie Cut performs best in moissanite, where its brilliance and fire together are highest: 29 for brilliance and 98 for fire. In diamond it scores 27 for brilliance and 82 for fire, against 93 and 78 for the T73 benchmark. Its scintillation, 86, comes from its pattern of facets, so it is the same in every stone.

Brilliance, fire and scintillation of the DG-Bowtie Cut in seven gemstones, out of 100, with the T73 Round Brilliant benchmark in each
Gemstone	Brilliance	Fire	Scintillation
Diamond	27 (T73 benchmark 93)	82 (T73 benchmark 78)	86 (T73 benchmark 80)
MoissaniteBest overallHighest brillianceHighest fire	29 (T73 benchmark 86)	98 (T73 benchmark 97)	86 (T73 benchmark 80)
Cubic Zirconia	26 (T73 benchmark 98)	90 (T73 benchmark 87)	86 (T73 benchmark 80)
Ruby	18 (T73 benchmark 94)	57 (T73 benchmark 37)	86 (T73 benchmark 80)
Sapphire	18 (T73 benchmark 94)	57 (T73 benchmark 37)	86 (T73 benchmark 80)
Emerald	13 (T73 benchmark 78)	70 (T73 benchmark 39)	86 (T73 benchmark 80)
Amethyst	12 (T73 benchmark 72)	64 (T73 benchmark 36)	86 (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-Bowtie 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.

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%	1.59 ct	Holds head-on light
Moissanite	2.648 to 2.691	22.2°	100%	1.45 ct	Holds head-on light
Cubic Zirconia	2.15 to 2.18	27.7°	100%	2.62 ct	Holds head-on light
Ruby	1.762 to 1.770	34.6°	100%	1.80 ct	Holds head-on light
Sapphire	1.762 to 1.770	34.6°	100%	1.80 ct	Holds head-on light
Emerald	1.577 to 1.583	39.4°	100%	1.23 ct	Holds head-on light
Amethyst	1.544 to 1.553	40.4°	100%	1.20 ct	Holds head-on light
Topaz	1.606 to 1.644	38.5°	100%	1.59 ct	Holds head-on light
Spinel	1.712 to 1.747	35.7°	100%	1.63 ct	Holds head-on light
Demantoid	1.881 to 1.888	32.1°	100%	1.74 ct	Holds head-on light
Zircon	1.925 to 1.984	31.3°	100%	2.10 ct	Holds head-on light
Tourmaline	1.603 to 1.655	38.6°	100%	1.41 ct	Holds head-on light
Peridot	1.650 to 1.690	37.3°	100%	1.51 ct	Holds head-on light
Tanzanite	1.685 to 1.707	36.4°	100%	1.51 ct	Holds head-on light
YAG	1.833	33.1°	100%	2.05 ct	Holds head-on light
Pyrope	1.730 to 1.766	35.3°	100%	1.70 ct	Holds head-on light
Almandine	1.750 to 1.830	34.8°	100%	1.86 ct	Holds head-on light
Spessartine	1.790 to 1.830	34.0°	100%	1.88 ct	Holds head-on light
Grossular	1.730 to 1.760	35.3°	100%	1.64 ct	Holds head-on light
Chrysoberyl	1.746 to 1.755	34.9°	100%	1.68 ct	Holds head-on light
Kunzite	1.660 to 1.676	37.0°	100%	1.43 ct	Holds head-on light
Iolite	1.542 to 1.551	40.4°	100%	1.18 ct	Holds head-on light
Morganite	1.572 to 1.600	39.5°	100%	1.29 ct	Holds head-on light
GGG	1.970	30.5°	100%	3.18 ct	Holds head-on light
Strontium titanate	2.409	24.5°	100%	2.31 ct	Holds head-on light
Synthetic rutile	2.616 to 2.903	22.5°	100%	1.92 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-Bowtie stone by stone: what each gemstone gains and loses in this cut, measured.

Grade the DG-Bowtie 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-Bowtie Cut: questions

What files come with the DG-Bowtie 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 87 planar facets.

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

Yes. The cutting files contain a GemCad .asc design (67 + 20 girdles = 87 facets, 64 index, 2-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-Bowtie 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, Amethyst, the whole pavilion reflects head-on light.

How accurate is the DG-Bowtie Cut cutting file?

We check it facet by facet against the 3D model that it was written from. Every crown and pavilion facet within 0.004° of the 3D model (average under 0.001°); girdle facets within 0.043°. 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-Bowtie Cut model, and what does it weigh?

The model measures 10.65 x 5.17 x 4.85 mm, which is 1.59 ct in diamond. At the same size, it weighs 1.45 ct in moissanite, 2.62 ct in cubic zirconia, 1.80 ct in ruby, 1.80 ct in sapphire, 1.23 ct in emerald, 1.20 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-Bowtie 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.