Rendered in our 3D Gemstone Simulator from the DG-Vitruvio model, 1.00 ct, studio light.
DG-Vitruvio Ruby
DG-Vitruvio keeps the 1919 crown and pavilion of the T-series and resolves the girdle into a band of 96 facets, 153 in all, over a 40.75° pavilion. In ruby its Brilliance is 94, exactly the T73's, and it lets 6% of the light out of the back where the T73 lets out 5%.
Where it pulls ahead is scintillation, which our census scores from the facet plan. Where it falls behind is the comparison with its own diamond twin: corundum's critical angle is 34.6° against diamond's 24.4°, and its dispersion 0.018 against 0.044, so the same design keeps less light when rocked and shows far less fire.
A round is the less usual outline for a ruby: much ruby rough grows as flat six-sided plates, and cutters tend to favour ovals and cushions that keep more of the crystal.
Is ruby a good match for DG-Vitruvio? Pros and cons
Compared with the T73 Round Brilliant in ruby and with the DG-Vitruvio in diamond.
A difference counts from 3 points (Brilliance, Fire, Tilt, Leakage), 5 (Scintillation,
Symmetry), 2 (Spread) 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-Vitruvio 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.
Against the T73 Round Brilliant in ruby: ahead on 2, level on 5, behind on 1.
Global81, the comparison 79, difference +2
Brilliance94, the comparison 94, difference 0
Fire37, the comparison 37, difference 0
Scintillation98, the comparison 80, difference +18
Spread100, the comparison 100, difference 0
Symmetry100, the comparison 100, difference 0
Shape-norm101, the comparison 102, difference −1
Tilt75, the comparison 75, difference 0
Face-up light census, a different measure from the Cut Grading Tool; Spread and Shape-norm above 100 sit on the ring.
Scintillation 98 against 80 for the T73 Round Brilliant in ruby: 18 points higher
Our scintillation score counts how finely the facet plan divides the face, and 153 facets give it far more to work with than the T73's 73. The crown and pavilion angles are the T73's, so the gain comes from the subdivided girdle, not from any change in how much light returns.
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.
Fire 37 against 79 for the DG-Vitruvio in diamond: 42 points lower
Corundum spreads white light into its colours less than half as strongly as diamond. Run the same 265 facets in both stones and our census gives the diamond 79 for fire, the ruby 37. In a saturated red, the few spectral flashes also have to compete with the body colour.
DG-Vitruvio in ruby · Fire 37
DG-Vitruvio in diamond · Fire 79
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: Corundum, not the girdle, sets this gap, and no round we measure closes it. For colour flashes in a red stone, the Oval Cut Ruby scores 74, the most in our ruby census.
Tilt 75 against 93 for the DG-Vitruvio in diamond: 18 points lower
Tilt measures how much of its face-up light a stone still returns when tipped by 20°. Ruby's larger critical angle opens a wider escape window in the pavilion, so as the stone rocks, more light finds a way out than it would in diamond.
DG-Vitruvio in ruby · Tilt 75
0° · 1% leak
10° · 11% leak
20° · 29% leak
30° · 30% leak
DG-Vitruvio in diamond · Tilt 93
0° · 4% leak
10° · 2% leak
20° · 9% leak
30° · 15% 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; grey is light leaving through the pavilion. The share under each frame is that picture's own.
What helps: Among the rounds in ruby, DG-Miliano Ruby holds the most when tipped, 83, at a cost of a few points of brilliance (90).
1.16 ct at 6.5 mm, against 1.02 ct for the same cut in diamond (+14%)
Ruby's specific gravity is 4.00 against diamond's 3.52, about 14% more weight for identical dimensions. A 6.5 mm DG-Vitruvio comes to 1.16 ct in ruby and 1.02 ct in diamond.
A DG-Vitruvio 6.5 mm across, weighed from the model's measured volume and each stone's specific gravity.
What helps: A ruby is set to its millimetres, not its carats, so compare DG-Vitruvio stones by width.
Leakage 6 against 2 for the DG-Vitruvio in diamond: 4 points higher
Our census loses 6% of the light through the pavilion, against 2% for the diamond version. It is a small share, within a point of the T73 in ruby; the gap is the material's, not the girdle's.
DG-Vitruvio in ruby · Leakage 6
0° · 1% leak
10° · 11% leak
20° · 29% leak
30° · 30% leak
DG-Vitruvio in diamond · Leakage 2
0° · 4% leak
10° · 2% leak
20° · 9% leak
30° · 15% 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: Size does not change the share. DG-M5 Ruby lets out 0% in ruby, the least of any cut on our ruby pages.
Choose DG-Vitruvio for a round ruby with the T73's light and a finer, livelier pattern, or for renders where the outline must read perfectly smooth. It gives up nothing to the T73 in ruby on brilliance and barely anything on leakage.
If the most light matters more than the finest sparkle, DG-M5 Ruby returns 100. If you want colour flashes from a ruby, a round is the wrong shape: the Oval Cut Ruby scores 74 for fire.
DG-Vitruvio Ruby: questions
Does DG-Vitruvio make a ruby sparkle more?
Yes, in our census: Scintillation 98 against 80 for the T73 Round Brilliant in ruby, with the same Brilliance of 94.
Does a DG-Vitruvio ruby have fire?
Not much: our census gives the ruby 37 for fire and the diamond version 79. Corundum's weak dispersion, not the 265 facets, is the limit.
What does a 6.5 mm DG-Vitruvio ruby weigh?
Weighed at 6.5 mm across, the ruby version comes to 1.16 ct and the diamond to 1.02 ct.
DG-Vitruvio or T73 for a ruby?
Light return is a tie at 94, and leakage nearly so, 6% against 5%. DG-Vitruvio sparkles more, 98 against 80; the T73 has the girdle most setters know.
Get the DG-Vitruvio Cut files
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DG-Vitruvio Cut 3D files
The DG-Vitruvio Cut as exact geometry: 265 planar facets, real-world scale, ready for CAD,
rendering, printing and casting.
