DG-Octagonal Kite Emerald: an eight-fold kite pattern, lighter in weight than in diamond

Brilliance 54 · Fire 40 · Scintillation 60 · in our census, where the T73 scores 78 · 39 · 80 in emerald

An eight-fold kite pattern: in emerald it returns 54 for Brilliance against 88 in diamond and leaks 45% of its light against 7%.

See it in the simulatorGet the files
The DG-Octagonal Kite in emerald, rendered at an angle in our 3D Gemstone Simulator under studio light
Rendered in our 3D Gemstone Simulator from the DG-Octagonal Kite model, 1.00 ct, studio light.

DG-Octagonal Kite Emerald

DG-Octagonal Kite has a large octagonal table, eight kites from the girdle corners to the table edges over eight triangles, and a pavilion of long kites closing to a point. The model counts 41 facets over a 55.0% table, with a 32.0° crown, 43.0° pavilion kites and 70.0% depth.

It was drawn for emerald, its pavilion kites set clear of the stone's 39.4° critical angle so that head-on light would reflect from the whole pavilion. In our census it scores 54 in emerald, with 45% leaking. In diamond the same model returns 88 and leaks 7%.

That is the honest headline: the design does far better in diamond than in emerald.

DG-Octagonal Kite in emerald: a fair match? Pros and cons

Pros

Cons

Compared with the T73 Round Brilliant in emerald and with the DG-Octagonal Kite 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 DG-Octagonal Kite in emerald (white) against the T73 Round Brilliant in emerald (dashed): solid white where it reaches further, hatched where it falls short. Each pro and con is explained, with pictures, below.

Performance wheel: DG-Octagonal Kite in emerald, against the T73 Round Brilliant in emerald as an outline. Solid white marks where it reaches further, hatching where it falls short. The scores are listed below.50100Global−9Brilliance−24Fire+1Scintillation−20Spread−4Symmetry0Shape-norm−21Tilt+23

Against the T73 Round Brilliant in emerald: ahead on 2, level on 1, behind on 5.

  • Global64, the comparison 73, difference −9
  • Brilliance54, the comparison 78, difference −24
  • Fire40, the comparison 39, difference +1
  • Scintillation60, the comparison 80, difference −20
  • Spread96, the comparison 100, difference −4
  • Symmetry100, the comparison 100, difference 0
  • Shape-norm63, the comparison 84, difference −21
  • Tilt100, the comparison 77, difference +23
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

What emerald gains in DG-Octagonal Kite

Lighter than in diamond

0.96 ct at 6.5 mm, against 1.25 ct for the same cut in diamond (−23%)

Emerald's 2.72 against diamond's 3.52 makes it the lighter stone: 0.96 ct at 6.5 mm across, against 1.25 ct in diamond.

Emerald0.96 ctDiamond1.25 ct
A DG-Octagonal Kite 6.5 mm across, weighed from the model's measured volume and each stone's specific gravity.

Try it yourself: Weights in all seven gemstones on the DG-Octagonal Kite page

The catch with a DG-Octagonal Kite emerald

About half the diamond version's fire

Fire 40 against 82 for the DG-Octagonal Kite in diamond: 42 points lower

40 against 82. In emerald it sits just above the T73's 39; the gap to diamond is the stone's, with a dispersion of 0.014 against 0.044.

Dg-octagonal kite in emerald face-up under a single bright light: a render from our simulator, its coloured flashes are the fire (score 40)

DG-Octagonal Kite in emerald · Fire 40

Dg-octagonal kite in diamond face-up under a single bright light: a render from our simulator, its coloured flashes are the fire (score 82)

DG-Octagonal Kite in diamond · Fire 82

Look at the coloured flashes: those are fire. Same light, same size, same face-up angle; rendered by our 3D Gemstone Simulator from each cut's own model.

What helps: For more colour in emerald with light to carry it, DG-Anteros Emerald scores 52.

Try it yourself: See the fire in the 3D Gemstone Simulator

Far more leakage than in diamond

Leakage 45 against 7 for the DG-Octagonal Kite in diamond: 38 points higher

45% against only 7% in diamond: in emerald, nearly half the light in our census finds a way out through the pavilion.

DG-Octagonal Kite in emerald · Leakage 45

Dg-octagonal kite in emerald tilted 0 degrees: Light Return map, 56% of the face leaking0° · 56% leak
Dg-octagonal kite in emerald tilted 10 degrees: Light Return map, 43% of the face leaking10° · 43% leak
Dg-octagonal kite in emerald tilted 20 degrees: Light Return map, 39% of the face leaking20° · 39% leak
Dg-octagonal kite in emerald tilted 30 degrees: Light Return map, 54% of the face leaking30° · 54% leak

DG-Octagonal Kite in diamond · Leakage 7

Dg-octagonal kite in diamond tilted 0 degrees: Light Return map, 3% of the face leaking0° · 3% leak
Dg-octagonal kite in diamond tilted 10 degrees: Light Return map, 6% of the face leaking10° · 6% leak
Dg-octagonal kite in diamond tilted 20 degrees: Light Return map, 18% of the face leaking20° · 18% leak
Dg-octagonal kite in diamond tilted 30 degrees: Light Return map, 22% of the face leaking30° · 22% leak
Each frame is the Light Return map with the stone tilted away from you by the angle shown; grey is light leaving through the pavilion. The share under each frame is that picture's own.

What helps: Steepening is not the fix: the pavilion kites already sit at 43.0°, above 39.4°. On an eight-sided outline, the Octagon Cut Emerald leaks 31%; DG-M5 Emerald leaks 10%.

Try it yourself: Tilt it yourself in the simulator's light map

Much less light than the diamond version

Brilliance 54 against 88 for the DG-Octagonal Kite in diamond: 34 points lower

54 against 88. The pavilion kites were drawn to clear emerald's critical angle, yet our head-on Light Return map of the emerald version is more grey than light, so in our census the design does not hold light in emerald as intended.

Dg-octagonal kite in emerald face-up Light Return map: red, green and blue show where the light returns from, grey shows where it leaks (Brilliance 54)

DG-Octagonal Kite in emerald · Brilliance 54

Dg-octagonal kite in diamond face-up Light Return map: red, green and blue show where the light returns from, grey shows where it leaks (Brilliance 88)

DG-Octagonal Kite in diamond · Brilliance 88

Red, green and blue = light returning to the eye; grey = light leaving through the pavilion. 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 Octagon Cut Emerald returns 69 on an eight-sided outline; DG-M5 Emerald 90, the most we measure in emerald.

Try it yourself: Open this Light Return map in the simulator

Fewer flashes than a round

Scintillation 60 against 80 for the T73 Round Brilliant in emerald: 20 points lower

Eight-fold kites give 41 facets, far fewer than the T73's 73, and the score follows: 60 to 80. Large kites make few, large flashes in any stone.

DG-Octagonal Kite · 41 facets · Scintillation 60

T73 Round Brilliant · 73 facets · Scintillation 80

Scintillation follows the number of facets: more facets, more and smaller flashes as the stone moves. Count the facets in each crown. Drawn from each cut's own model.

What helps: The Octagon Cut Emerald scores 66; for fine sparkle, DG-Vitruvio Emerald 98.

Try it yourself: Compare the Scintillation spoke in the Cut Performance Wheel

Who a DG-Octagonal Kite emerald suits

DG-Octagonal Kite suits a bold, symmetrical emerald centre stone where the kite pattern is the point. Its Tilt is 100, the whole of its face-up light kept when tipped, but from a Brilliance of 54; we do not count a stone keeping a modest amount as a pro.

For an eight-sided emerald with more light, the Octagon Cut Emerald. Cut in diamond instead, the same design returns 88 for light.

DG-Octagonal Kite Emerald: questions

Is DG-Octagonal Kite good for emerald?

Middling in emerald: Brilliance 54 against 78 for the T73, 45% leakage and Fire 40.

Why does DG-Octagonal Kite do better in diamond?

The geometry is the same; the stone changes. Diamond's critical angle is about 24°, emerald's 39.4°, so diamond turns back light that emerald lets through: 88 against 54 in our census.

DG-Octagonal Kite or Octagon for an emerald?

The Octagon returns more light (69 against 54), leaks less (31% against 45%) and sparkles a little more (66 against 60). DG-Octagonal Kite has slightly more fire, 40 against 34.

What does a 6.5 mm DG-Octagonal Kite emerald weigh?

0.96 ct, against 1.25 ct for the same model in diamond.

Get the DG-Octagonal Kite Cut files

6 formatsMillimetresWatertight

DG-Octagonal Kite Cut 3D files

The DG-Octagonal Kite Cut as exact geometry: 41 planar facets, real-world scale, ready for CAD, rendering, printing and casting.

  • STEPExact faceted solid for CAD
  • 3DMRhino, closed mesh on its own layer
  • STLWatertight mesh for printing and casting
  • OBJMesh for modelling and rendering
  • FBXBlender, 3ds Max, Maya, Cinema 4D, Unity, Unreal
  • GLBWeb, AR and quick previews
€9.99 · Personal useBuy the 3D files
GemCad96 index

DG-Octagonal Kite Cut cutting files

The DG-Octagonal Kite Cut as a faceting design: 33 + 8 girdles = 41 facets, 96 index, 8-fold mirror-image symmetry, ready for the machine.

  • .ascGemCad design file, 96 index gear
  • .csvTier table: angles, indices and cutting order
  • DiagramPrintable faceting diagram
€9.99 · Personal useBuy the cutting files

Questions before you buy? Email us.

More gemstones and cuts

Emerald: optical properties and the top ten cuts · The DG-Octagonal Kite: specifications, model and files

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The DG-Octagonal Kite in other gemstones