DG-Octagonal Kite Ruby: an even eight-fold face, with less light and fire than in diamond

Brilliance 74 · Fire 34 · Scintillation 60 · in our census, where the T73 scores 94 · 37 · 80 in ruby

Bright in diamond, DG-Octagonal Kite gives up some light and most of its fire in ruby.

See it in the simulatorGet the files
The DG-Octagonal Kite in ruby, 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 Ruby

Eight crown kites frame a large octagonal table above eight girdle triangles, and long kites below close the pavilion to a point. In our model that comes to 41 facets over a 70.0% depth, with a 55.0% table, a 32.0° crown and a 43.0° pavilion.

Its pavilion kites were set for emerald, clear of that stone's critical angle. In ruby they are clear too, at 43.0° against ruby's 34.6°, and above the 36.4° guide minimum, yet 26% of the light still leaks; our census measures the loss, not its path.

In diamond it returns 88 and leaks 7%; the ruby keeps less.

DG-Octagonal Kite in ruby: pros and cons

Pros

None by our margins. Tilt is 95, on less light than the T73.

Cons

Compared with the T73 Round Brilliant in ruby 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 ruby (white) against the T73 Round Brilliant in ruby (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 ruby, against the T73 Round Brilliant in ruby as an outline. Solid white marks where it reaches further, hatching where it falls short. The scores are listed below.50100Global−8Brilliance−20Fire−3Scintillation−20Spread−4Symmetry0Shape-norm−17Tilt+20

Against the T73 Round Brilliant in ruby: ahead on 1, level on 1, behind on 6.

  • Global71, the comparison 79, difference −8
  • Brilliance74, the comparison 94, difference −20
  • Fire34, the comparison 37, difference −3
  • Scintillation60, the comparison 80, difference −20
  • Spread96, the comparison 100, difference −4
  • Symmetry100, the comparison 100, difference 0
  • Shape-norm85, the comparison 102, difference −17
  • Tilt95, the comparison 75, difference +20
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 ruby gains in DG-Octagonal Kite

Only Tilt beats a baseline here, and it beats both: 95, against 75 for the T73 and 89 for the diamond version. Our rules still leave it out, since tilt is a pro only for a stone within five points of the brilliance it is set against, and the ruby's 74 is well short of both 94 and 88. Symmetry is level at 100. Its offer is an even, eight-fold face on a large table, for a bold centre stone.

DG-Octagonal Kite's costs in ruby

Well under half the diamond version's fire

Fire 34 against 82 for the DG-Octagonal Kite in diamond: 48 points lower

Corundum disperses light at 0.018, diamond at 0.044, and the large table and long kites give few small facets to break light up. The ruby also trails the T73 in ruby, 34 to 37.

Dg-octagonal kite in ruby face-up under a single bright light: a render from our simulator, its coloured flashes are the fire (score 34)

DG-Octagonal Kite in ruby · Fire 34

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: Among ruby cuts near the T73's light, DG-Anteros Ruby scores 43 for fire and the Trilliant Cut Ruby 52.

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

A quarter of the light leaks

Leakage 26 against 5 for the T73 Round Brilliant in ruby: 21 points higher

26% in our census, against 5% for the T73 and 7% for the design in diamond.

DG-Octagonal Kite in ruby · Leakage 26

Dg-octagonal kite in ruby tilted 0 degrees: Light Return map, 28% of the face leaking0° · 28% leak
Dg-octagonal kite in ruby tilted 10 degrees: Light Return map, 22% of the face leaking10° · 22% leak
Dg-octagonal kite in ruby tilted 20 degrees: Light Return map, 30% of the face leaking20° · 30% leak
Dg-octagonal kite in ruby tilted 30 degrees: Light Return map, 38% of the face leaking30° · 38% leak

T73 Round Brilliant in ruby · Leakage 5

T73 round brilliant in ruby tilted 0 degrees: Light Return map, 1% of the face leaking0° · 1% leak
T73 round brilliant in ruby tilted 10 degrees: Light Return map, 10% of the face leaking10° · 10% leak
T73 round brilliant in ruby tilted 20 degrees: Light Return map, 29% of the face leaking20° · 29% leak
T73 round brilliant in ruby tilted 30 degrees: Light Return map, 30% of the face leaking30° · 30% 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: We have not measured a steeper DG-Octagonal Kite; its 43.0° pavilion already clears the guide minimum. DG-M5 Ruby lets out 0%; the plain Octagon Cut Ruby 20%.

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

About a fifth less light than a round ruby

Brilliance 74 against 94 for the T73 Round Brilliant in ruby: 20 points lower

The 43.0° pavilion kites clear ruby's critical angle, so the loss is not light falling straight through. Against its own diamond version the gap is smaller, 74 to 88.

Dg-octagonal kite in ruby face-up Light Return map: red, green and blue show where the light returns from, grey shows where it leaks (Brilliance 74)

DG-Octagonal Kite in ruby · Brilliance 74

T73 round brilliant in ruby face-up Light Return map: red, green and blue show where the light returns from, grey shows where it leaks (Brilliance 94)

T73 Round Brilliant in ruby · Brilliance 94

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: For an octagonal outline with a little more light, the Octagon Cut Ruby returns 78; for the most, DG-M5 Ruby, 100.

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 ruby: 20 points lower

41 facets, many of them large kites, against the T73's 73: a slower, bolder pattern.

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 Ruby scores 66; a round such as DG-Vitruvio Ruby 98.

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

Who DG-Octagonal Kite in ruby suits

In ruby, DG-Octagonal Kite suits a bold, symmetrical centre stone where steady light matters more than fire. It does better in diamond: 88 for brilliance and 82 for fire.

For more light in ruby, DG-M5 Ruby; for an octagon with a little more light and less leakage, the Octagon Cut Ruby.

DG-Octagonal Kite Ruby: questions

Is DG-Octagonal Kite good for ruby?

It returns 74 against the T73's 94 and holds its light when tipped, Tilt 95; its fire is low, 34.

DG-Octagonal Kite in ruby or diamond?

Diamond, for light and fire: Brilliance 88 against 74, Fire 82 against 34, leakage 7% against 26%.

DG-Octagonal Kite or Octagon cut ruby?

Close: the Octagon returns 78 against 74 and leaks 20% against 26%; DG-Octagonal Kite holds a little more light when tilted, 95 against 87.

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.

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Ruby: 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