Brilliance 78 · Fire 38 · Scintillation 83 · in our census, where the T73 scores 78 · 39 · 80 in emerald
A diamond design carried into emerald: its split hearts do not form here, and on light it is level with the T73 at Brilliance 78. What it gains is a lighter stone: 0.78 ct at 6.5 mm, where the diamond version weighs 1.01 ct.
This is our T73 with eight narrow crack facets polished onto the pavilion, one on each ridge where two lower girdle halves meet between the mains. They take the plan from 73 facets to 81; the T73's 53.0% table, 34.5° crown and 40.75° pavilion stay as they were.
The crack facets were drawn for diamond, where our simulated Hearts and Arrows viewer shows each of the eight hearts split down the middle by a thin line. In emerald, as in every stone we model other than diamond, the hearts do not form.
What emerald keeps is the T73's light: Brilliance 78 against 78, leakage 22% against 22%. Scintillation reads 83 against the T73's 80: the eight extra facets add a few points, too few for us to count as a gain. The cons below are the gaps to this cut in diamond.
Compared with the T73 Round Brilliant in emerald 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 emerald (white) against the T73 Round Brilliant in emerald (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 emerald: ahead on 2, level on 4, behind on 2.
0.78 ct at 6.5 mm, against 1.01 ct for the same cut in diamond (−23%)
Beryl's specific gravity is 2.72 and diamond's 3.52: at 6.5 mm across this cut weighs 0.78 ct in emerald and 1.01 ct in diamond. Per carat it faces up the same as the T73, 100 against 100.
Try it yourself: Weights in all seven gemstones on the DG-Broken Hearts and Arrows page
Fire 38 against 78 for the DG-Broken Hearts and Arrows in diamond: 40 points lower
38 in emerald against 78 in diamond, and 39 for the T73 in emerald. Emerald's dispersion, 0.014, is under a third of diamond's 0.044, and small facets cannot make that up.
DG-Broken Hearts and Arrows in emerald · Fire 38
DG-Broken Hearts and Arrows in diamond · Fire 78
What helps: Mostly this is emerald itself. Of the rounds brighter than the T73 here, DG-Anteros Emerald has the most fire: 52.
Leakage 22 against 2 for the DG-Broken Hearts and Arrows in diamond: 20 points higher
Here 22% of the light in our census leaves through the pavilion; in diamond, 2%. The T73 in emerald loses the same 22%. The strip shows the emerald's grey rising from about a tenth head-on to about a third at 10° and 20°, a little more at 30°, while the diamond's stays at a seventh or under.
DG-Broken Hearts and Arrows in emerald · Leakage 22
DG-Broken Hearts and Arrows in diamond · Leakage 2
What helps: Steepening is not the fix: the mains sit at 40.75°, above the 39.4° guide minimum. DG-M5 Emerald leaks 10%, the least we measure in emerald.
Try it yourself: Tilt it yourself in the simulator's light map
Brilliance 78 against 94 for the DG-Broken Hearts and Arrows in diamond: 16 points lower
78 here against 94 for the diamond version, and level with the T73 in emerald. The emerald Light Return map has a ring of grey wedges at the rim, where the diamond map shows only small grey notches there and a few specks inside.
DG-Broken Hearts and Arrows in emerald · Brilliance 78
DG-Broken Hearts and Arrows in diamond · Brilliance 94
What helps: Two of our rounds return clearly more light in emerald: DG-M5 Emerald at 90 and DG-Anteros Emerald at 86.
Try it yourself: Open this Light Return map in the simulator
Tilt 79 against 92 for the DG-Broken Hearts and Arrows in diamond: 13 points lower
Tilted 20°, it keeps 79 of its face-up light; the diamond version keeps 92. In emerald it is a shade steadier than the T73, which keeps 77.
DG-Broken Hearts and Arrows in emerald · Tilt 79
DG-Broken Hearts and Arrows in diamond · Tilt 92
What helps: The square brilliant keeps 85 at 68 brilliance, the steadiest cut within 10 points of the T73's light here.
Try it yourself: Compare the Tilt spoke in the Cut Performance Wheel
A diamond design first: in emerald the pattern does not form, and the light is the T73's on a plan with eight more facets. It suits an emerald cut to match a diamond of the same design; for an emerald on its own, the T73 gives the same light with eight fewer facets to polish.
For more light, DG-M5 Emerald. For far more scintillation at the same light, DG-Vitruvio Emerald, at 98.
No: in our simulated viewer the split hearts appear only in diamond. In emerald the hearts do not form.
On light they match: Brilliance 78 against 78, leakage 22% against 22%. Scintillation is close, 83 against 80, and so is Tilt, 79 against 77.
A sound round, not a leading one: Brilliance 78, where DG-M5 returns 90.
0.78 ct in our model; in diamond the same stone 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.
Emerald: optical properties and the top ten cuts · The DG-Broken Hearts and Arrows: specifications, model and files