Brilliance 88 · Fire 97 · Scintillation 83 · in our census, where the T73 scores 86 · 97 · 80 in moissanite
A T73 with eight hairline facets polished onto its pavilion. The split hearts they draw belong to diamond; in moissanite this round measures close to a plain T73, with fire well above its diamond twin's.
The T73's proportions stay as they are: table 53.0%, crown 34.5°, pavilion mains 40.75°. Each ridge where two lower girdle halves meet between the mains gets one narrow extra facet, which brings the count to 81. On a stone 6.5 mm across those additions are about a tenth of a millimetre wide.
The cut was drawn for diamond. In our simulated Hearts and Arrows viewer a diamond shows its eight hearts each split down the middle by a thin line, while in moissanite no hearts form for the line to split. What this page can measure is light.
Set against the T73 in moissanite, the numbers barely move: Brilliance 88 against 86, Fire 97 against 97, Tilt 92 against 94, and 7% leakage against 7%. Set against the same model in diamond, it gains fire and gives up light.
Compared with the T73 Round Brilliant in moissanite and with the DG-Broken Hearts and Arrows 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.
At a glance: the DG-Broken Hearts and Arrows 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 4, level on 3, behind on 1.
Fire 97 against 78 for the DG-Broken Hearts and Arrows in diamond: 19 points higher
The model and the lighting stay fixed between the two renders and the material alone changes, taking fire from 78 to 97. The moissanite render carries a few broad bands of blue, yellow and red around the table, where the diamond one shows small scattered sparks.
DG-Broken Hearts and Arrows in moissanite · Fire 97
DG-Broken Hearts and Arrows in diamond · Fire 78
0.92 ct at 6.5 mm, against 1.01 ct for the same cut in diamond (−9%)
The facet plan has no say in this figure; density does. At a specific gravity of 3.22 against diamond's 3.52, the moissanite stone is the lighter at every size.
Try it yourself: Weights in all seven gemstones on the DG-Broken Hearts and Arrows page
Brilliance 88 against 94 for the DG-Broken Hearts and Arrows in diamond: 6 points lower
These are the T73's angles, worked out for diamond. Moissanite bends light more strongly, and through them some of it leaves away from the eye. In the head-on maps the moissanite stone shows grey patches in a ring part-way out from the table and a few at the edge; the diamond's grey is mostly small notches at the girdle, with a few specks further in.
DG-Broken Hearts and Arrows in moissanite · Brilliance 88
DG-Broken Hearts and Arrows in diamond · Brilliance 94
What helps: Steepening is not what our numbers suggest: the mains, at 40.75°, already clear the 39.5° minimum we use as a guide for moissanite rounds. For more light, choose a cut drawn for this stone: DG-Anteros Moissanite returns 92 and DG-M5 Moissanite 98.
Try it yourself: Open this Light Return map in the simulator
Leakage 7 against 2 for the DG-Broken Hearts and Arrows in diamond: 5 points higher
In our census 7% of the light leaves through the back in moissanite and 2% in diamond. Both strips hold least grey at 10° and most at 30°. The gap between them is widest at 0° and all but closes from 20° on.
DG-Broken Hearts and Arrows in moissanite · Leakage 7
DG-Broken Hearts and Arrows in diamond · Leakage 2
What helps: A larger or smaller stone loses the same share. Of our rounds in moissanite, DG-Anteros leaks 3%, DG-M5 1% and the T105 Round Brilliant Moissanite 6%.
Try it yourself: Tilt it yourself in the simulator's light map
In moissanite this is close to a T73, with a slightly higher light score and eight more facets to cut: choose it if you want the same plan in moissanite as in a diamond of this design.
The broken hearts need diamond, so for that pattern see DG-Broken Hearts and Arrows Diamond.
For a round drawn for this stone, DG-Anteros Moissanite re-solves the T73's angles, and the site's cut copy describes it forming eight clean hearts in moissanite. DG-M5 Moissanite returns the most light we measure here.
No. In our simulated viewer the hearts form only in diamond, so a moissanite stone in this cut has none for the crack facets to split.
On light, by a small margin: 88 against 86. Fire is level at 97, and tilt is 92 against 94. Scintillation, which counts facets and not their size, reads 83 against 80, a gap too small for us to list as a pro.
Last, on a finished T73 pavilion, one on each of the eight ridges between pairs of lower girdle halves, on a 96 index gear. Against the plain T73 in moissanite they move light, fire and tilt by about two points or less.
0.92 ct. The diamond version of that width weighs 1.01 ct.
The DG-Broken Hearts and Arrows Cut as exact geometry: 81 planar facets, real-world scale, ready for CAD, rendering, printing and casting.
The DG-Broken Hearts and Arrows Cut as a faceting design: 65 + 16 girdles = 81 facets, 96 index, 8-fold mirror-image symmetry, ready for the machine.
Questions before you buy? Email us.
Moissanite: optical properties and the top ten cuts · The DG-Broken Hearts and Arrows: specifications, model and files