T105 Round Brilliant Moissanite: Pros & Cons

The T105 keeps the T57's main angles and divides the plan more finely: eight star halves on the crown, three rows of lower halves on the pavilion where the T57 has one, and eight pavilion star halves at the girdle. There is no girdle band: the crown runs straight into the pavilion. The model has 105 facets, a 40.75° pavilion and a depth of 59.3%.

In moissanite it matches the T73 on light, 86 against 86, and on fire. The extra facets buy sparkle. Against the diamond T105 it gives up light and lets more out of the back, and against the T73 it keeps slightly less when tipped.

T105 round moissanite: good choice or not? Pros and cons

Pros

Far more fire than in diamond 97 vs 77
Finer sparkle than the T73 90 vs 80
Lighter than in diamond 0.84 vs 0.92 ct

Cons

Less light than in diamond 86 vs 95
More leakage than in diamond 6 vs 1
Keeps a little less light when tipped 91 vs 94

Compared with the T73 Round Brilliant in moissanite and with the T105 Round Brilliant 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 T105 Round Brilliant in moissanite (white) against the T73 Round Brilliant in moissanite (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 moissanite: ahead on 3, level on 4, behind on 1.

Global92, the comparison 91, difference +1
Brilliance86, the comparison 86, difference 0
Fire97, the comparison 97, difference 0
Scintillation90, the comparison 80, difference +10
Spread101, the comparison 100, difference +1
Symmetry100, the comparison 100, difference 0
Shape-norm93, the comparison 93, difference 0
Tilt91, the comparison 94, difference −3

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 moissanite gains in a T105

Far more fire than in diamond

Fire 97 against 77 for the T105 Round Brilliant in diamond: 20 points higher

Diamond gives this plan 77, moissanite 97. The facets did not change between the two renders; the dispersion did, from 0.044 to 0.104.

T105 round brilliant in moissanite face-up under a single bright light: a render from our simulator, its coloured flashes are the fire (score 97) — 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.

T105 round brilliant in diamond face-up under a single bright light: a render from our simulator, its coloured flashes are the fire (score 77) — 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.

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

Finer sparkle than the T73

Scintillation 90 against 80 for the T73 Round Brilliant in moissanite: 10 points higher

Every extra row of halves adds facets for light to flash from, and our scintillation score follows the count: 105 facets here, 73 on the T73.

T105 Round Brilliant · 105 facets · Scintillation 90

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

Lighter than in diamond

0.84 ct at 6.5 mm, against 0.92 ct for the same cut in diamond (−9%)

A shallow knife-edge round, cut in the lighter material: the bars at 6.5 mm put it below the diamond T105.

A T105 Round Brilliant 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 T105 Round Brilliant page

The catch with a T105 moissanite

Less light than in diamond

Brilliance 86 against 95 for the T105 Round Brilliant in diamond: 9 points lower

The angles are the classic diamond set, and diamond returns 95 through them. Moissanite bends light more strongly, and part of it misses the eye. Against the T73 in moissanite the T105 is level.

T105 round brilliant in moissanite face-up Light Return map: red, green and blue show where the light returns from, grey shows where it leaks (Brilliance 86) — 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.

T105 round brilliant in diamond face-up Light Return map: red, green and blue show where the light returns from, grey shows where it leaks (Brilliance 95) — 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 Moissanite and DG-Anteros Moissanite were drawn for moissanite and return 98 and 92.

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

More leakage than in diamond

Leakage 6 against 1 for the T105 Round Brilliant in diamond: 5 points higher

In diamond this cut leaks almost nothing, 1%. In moissanite 6% leaves through the pavilion, still the third lowest of the cuts we sell in this stone.

T105 round brilliant in moissanite tilted 0 degrees: Light Return map, 2% 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.

T105 round brilliant in moissanite tilted 10 degrees: Light Return map, 8% 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: Size does not change the share, and at 40.75° the pavilion already clears the 39.5° guide minimum, so a steeper one is not the remedy. DG-M5 leaks 1%.

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

Keeps a little less light when tipped

Tilt 91 against 94 for the T73 Round Brilliant in moissanite: 3 points lower

Tipped by 20°, the T105 holds 91 of its face-up light, where the T73 holds 94. It is the only score on which the T73 is ahead.

What helps: DG-Miliano Moissanite keeps 95 when tipped, at the same brilliance, 86, and sparkles more.

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

Who a T105 moissanite suits

The T105 suits a round moissanite where you want more sparkle than the T73 gives without losing light: level on brilliance and fire, ahead on scintillation.

Its knife edge needs protecting in a setting; for a girdle a setter can seat, choose the T73 Round Brilliant Moissanite.

For more light, DG-M5 Moissanite. For still more sparkle, DG-Miliano Moissanite.

T105 Round Brilliant Moissanite: questions

T105 or T73 for a moissanite?

Level on light (86 against 86) and fire. The T105 sparkles more (90 against 80); the T73 holds a little more light when tipped and has a girdle band.

Does the T105 leak light in moissanite?

6% in our census, against 7% for the T73 and 1% for the T105 in diamond.

How many facets does the T105 have?

105, against 73 on the T73, with no girdle band.

What does a 6.5 mm T105 moissanite weigh?

0.84 ct. A diamond T105 that wide is 0.92 ct.

Get the T105 Round Brilliant Cut files

6 formatsMillimetresWatertight

T105 Round Brilliant Cut 3D files

The T105 Round Brilliant Cut as exact geometry: 105 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

T105 Round Brilliant Cut cutting files

The T105 Round Brilliant Cut as a faceting design: 105 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

Moissanite: optical properties and the top ten cuts · The T105 Round Brilliant: specifications, model and files

T105 Round Brilliant Moissanite: more fire than diamond, finer sparkle than the T73