DG-Vitruvio Amethyst: Pros, Cons & Sparkle

DG-Vitruvio keeps the classic crown and pavilion and puts all of its extra work at the girdle: 153 facets in all, on a 40.75° pavilion, 61.9% deep. In amethyst its light figures sit within a point of the T73's: Brilliance 71 against 72, leakage 29% against 28%, Tilt 81 against 80.

What changes is sparkle. Our scintillation score is worked out from the facet plan, and the girdle band lifts it to the top of the scale. The cons are those every round shares in quartz, set against the same cut in diamond, where they are large.

Does amethyst suit DG-Vitruvio? Pros and cons

Pros

Lighter than diamond at the same size 0.77 vs 1.02 ct
Much more sparkle than the T73 98 vs 80

Cons

Far less fire than the diamond version 36 vs 79
Much more leakage than in diamond 29 vs 2
Less light than in diamond 71 vs 93
Holds less light when tipped than in diamond 81 vs 93

Compared with the T73 Round Brilliant in amethyst 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 amethyst (white) against the T73 Round Brilliant in amethyst (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 amethyst: ahead on 3, level on 3, behind on 2.

Global71, the comparison 70, difference +1
Brilliance71, the comparison 72, difference −1
Fire36, the comparison 36, difference 0
Scintillation98, the comparison 80, difference +18
Spread100, the comparison 100, difference 0
Symmetry100, the comparison 100, difference 0
Shape-norm76, the comparison 77, difference −1
Tilt81, the comparison 80, difference +1

Face-up light census, a different measure from the Cut Grading Tool; Spread and Shape-norm above 100 sit on the ring.

Open it in the Cut Performance Wheel

What amethyst gains in DG-Vitruvio

Lighter than diamond at the same size

0.77 ct at 6.5 mm, against 1.02 ct for the same cut in diamond (−25%)

A 6.5 mm DG-Vitruvio in amethyst is 0.77 ct; in diamond it would be 1.02 ct. The difference is quartz's lower density, 2.65 to 3.52.

A DG-Vitruvio 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-Vitruvio page

Much more sparkle than the T73

Scintillation 98 against 80 for the T73 Round Brilliant in amethyst: 18 points higher

The 96-facet girdle breaks the rim into many small faces, and a score that follows the facet plan rises with them. Expect a finer glitter round the edge than a T73 shows.

DG-Vitruvio · 153 facets · Scintillation 98

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.

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

What quartz costs DG-Vitruvio

Far less fire than the diamond version

Fire 36 against 79 for the DG-Vitruvio in diamond: 43 points lower

With quartz's dispersion at 0.013, the colour split is weak before a single facet is cut. In diamond the same crown and girdle score 79.

Dg-vitruvio in amethyst face-up under a single bright light: a render from our simulator, its coloured flashes are the fire (score 36) — 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.

Dg-vitruvio in diamond face-up under a single bright light: a render from our simulator, its coloured flashes are the fire (score 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: For more colour in amethyst, the Oval Cut Amethyst scores 69; among rounds, DG-Anteros Amethyst reaches 54.

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

Much more leakage than in diamond

Leakage 29 against 2 for the DG-Vitruvio in diamond: 27 points higher

Quartz holds light by total internal reflection only beyond 40.4°, against 24.4° in diamond, so more of what reaches the pavilion passes through it. The diamond version lets almost nothing out.

Dg-vitruvio in amethyst tilted 0 degrees: Light Return map, 15% of the face leaking — 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.

Dg-vitruvio in amethyst tilted 10 degrees: Light Return map, 38% of the face leaking — 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 our data supports: the pavilion is already at 40.75°, above amethyst's 40.4° guide minimum. DG-M5 Amethyst leaks 15%.

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

Less light than in diamond

Brilliance 71 against 93 for the DG-Vitruvio in diamond: 22 points lower

Girdle facets add sparkle, not light: in amethyst DG-Vitruvio returns what the T73 returns, and both sit well under the diamond figure.

Dg-vitruvio in amethyst face-up Light Return map: red, green and blue show where the light returns from, grey shows where it leaks (Brilliance 71) — 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.

Dg-vitruvio in diamond face-up Light Return map: red, green and blue show where the light returns from, grey shows where it leaks (Brilliance 93) — 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: DG-M5 Amethyst returns 85 in amethyst, DG-Anteros Amethyst 82.

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

Holds less light when tipped than in diamond

Tilt 81 against 93 for the DG-Vitruvio in diamond: 12 points lower

At a 20° tip the amethyst DG-Vitruvio holds on to 81 of its face-up light, the diamond one to 93. In quartz it matches the T73 here too.

What helps: Of the rounds, the T105 Round Brilliant Amethyst keeps 87 when tipped, but at 65 brilliance.

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

Who a DG-Vitruvio amethyst suits

Choose DG-Vitruvio for a round amethyst where a smooth, glittering outline matters, in renders or in a setting that shows the girdle. It gives everything the T73 gives in this stone, plus sparkle.

Ninety-six girdle facets are a lot of extra work at the machine. For a hobby cutter's first amethyst, the T73 Round Brilliant Amethyst gives the same light in far fewer steps.

For more light, DG-M5 Amethyst. For more fire, the Oval Cut Amethyst.

DG-Vitruvio Amethyst: questions

Does DG-Vitruvio sparkle more than a round brilliant in amethyst?

Yes: Scintillation 98 against 80 for the T73, from 153 facets against 73.

Is DG-Vitruvio brighter than the T73 in amethyst?

No, about level: Brilliance 71 against 72, and leakage 29% against 28%.

DG-Vitruvio or DG-Miliano for amethyst?

Both reach the top of our sparkle scale; DG-Vitruvio returns far more light (71 against 60) and leaks less (29% against 40%).

What does a 6.5 mm DG-Vitruvio amethyst weigh?

0.77 ct, against 1.02 ct for the diamond version.

Get the DG-Vitruvio Cut files

6 formatsMillimetresWatertight

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.

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-Vitruvio Cut cutting files

The DG-Vitruvio Cut as a faceting design: 57 + 96 girdles = 153 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

Amethyst: optical properties and the top ten cuts · The DG-Vitruvio: specifications, model and files

DG-Vitruvio Amethyst: the T73's light with sparkle at the top of our scale