Brilliance 27 · Fire 72 · Scintillation 51 · in our census, where the T73 scores 94 · 37 · 80 in sapphire
Step cut the same on both faces, with a window behind the table by design: in sapphire it shows strong fire and loses much of its light.
DG-Elongated Hexagon is a long hexagon with square points, step cut alike on front and back: two steps either side of a six-facet girdle, a table in front and a flat of the same size behind. It was drawn for emerald, and reads the same from either side, for pendants and open settings. Our model is 1.7 to 1 and 45.3% deep, with 32 facets, a 36.0° crown and a 36.0° pavilion.
One census note matters here. The back flat is a window by design, and the cut's own page leaves it out of the head-on figures. Our census counts the light through it as lost, so the light and leakage figures on this page include the window.
Against the T73 it gains fire and face-up size. It loses light and sparkle, and, against the same design in diamond, its hold on light when tipped.
Compared with the T73 Round Brilliant in sapphire and with the DG-Elongated Hexagon 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-Elongated Hexagon in sapphire (white) against the T73 Round Brilliant in sapphire (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 sapphire: ahead on 2, behind on 6.
Fire 72 against 37 for the T73 Round Brilliant in sapphire: 35 points higher
Fire 72 against 37, second in our sapphire census only to the oval. It is colour in a stone that returns little light, 27, and the diamond version shows more still, 97.
DG-Elongated Hexagon in sapphire · Fire 72
T73 Round Brilliant in sapphire · Fire 37
Face-up size 107 against 100 for the T73 Round Brilliant in sapphire (T73 = 100): 7% more face-up area for the same weight
Measured from each model's outline, a carat of it spreads over more face than the T73.
DG-Elongated Hexagon · 8.71 x 5.12 mm at 1.00 ct · Face-up size 107
T73 Round Brilliant · 6.21 mm at 1.00 ct · Face-up size 100
Try it yourself: See its size at 1.00 ct in sapphire in the 3D Gemstone Simulator
Brilliance 27 against 94 for the T73 Round Brilliant in sapphire: 67 points lower
Brilliance 27 against 94, with the window counted as lost. The same design in diamond returns even less, 12.
DG-Elongated Hexagon in sapphire · Brilliance 27
T73 Round Brilliant in sapphire · Brilliance 94
What helps: The open back is the design; we have measured no closed version. For a long step cut that keeps more light in sapphire, the Emerald Cut Sapphire returns 65.
Try it yourself: Open this Light Return map in the simulator
Leakage 64 against 5 for the T73 Round Brilliant in sapphire: 59 points higher
64% of the light in our census goes out of the back, against 5% for the T73. That figure includes the window behind the table, which the design leaves open on purpose; our census does not report how much of the leak passes through it.
DG-Elongated Hexagon in sapphire · Leakage 64
T73 Round Brilliant in sapphire · Leakage 5
What helps: For a stone that keeps its light, DG-M5 Sapphire leaks 0% and the Emerald Cut Sapphire 25%.
Try it yourself: Tilt it yourself in the simulator's light map
Tilt 56 against 100 for the DG-Elongated Hexagon in diamond: 44 points lower
Tilted 20°, the sapphire keeps 56 of its face-up light, the diamond version 100. The diamond starts from very little light, Brilliance 12, so its full score is a share of a small amount.
DG-Elongated Hexagon in sapphire · Tilt 56
DG-Elongated Hexagon in diamond · Tilt 100
What helps: Among sapphire cuts with near-round light, DG-Anteros Sapphire keeps 78 when tipped.
Try it yourself: Compare the Tilt spoke in the Cut Performance Wheel
Scintillation 51 against 80 for the T73 Round Brilliant in sapphire: 29 points lower
Scintillation 51 against 80. A step cut of 32 facets, it has broad, flat steps where the T73 has 73 brilliant facets.
DG-Elongated Hexagon · 32 facets · Scintillation 51
T73 Round Brilliant · 73 facets · Scintillation 80
What helps: As a long step cut, the Emerald Cut Sapphire scores 72 for scintillation.
Try it yourself: Compare the Scintillation spoke in the Cut Performance Wheel
DG-Elongated Hexagon suits a pendant or open setting where both faces are seen and the window is part of the look. In sapphire it brings strong fire for the stone and a large face for its weight.
If the stone should look bright face-up, choose something else: the Emerald Cut Sapphire for a long step cut, or DG-M5 Sapphire for the most light.
One reason is the design: its back flat is a window, and our census counts the light through it as lost. In all 64% leaves through the back, against 5% for the T73; the census does not say how much of that goes through the window.
Yes, for sapphire: Fire 72, nearly twice the T73's 37. The same design in diamond reaches 97.
It comes to 2.05 ct at that width, against 1.80 ct in diamond.
The DG-Elongated Hexagon Cut as exact geometry: 32 planar facets, real-world scale, ready for CAD, rendering, printing and casting.
The DG-Elongated Hexagon Cut as a faceting design: 26 + 6 girdles = 32 facets, 96 index, 2-fold mirror-image symmetry, ready for the machine.
Questions before you buy? Email us.
Sapphire: optical properties and the top ten cuts · The DG-Elongated Hexagon: specifications, model and files