Pseudo-Radiant 1.25

by Arya Akhavan, adapted from ??? (November 2014)
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Gemology Projectopen
L/W
125%
Design RI
1.58
H/W
74%
Gear
96
V/W³
0.427
Symmetry
2 (mirrored)
Facets
63
Tiers
21
Crown
25
Pavilion
38

Someone from Gemology Online sent me a basic crown and pavilion layout and asked me to come up with a similar design that had less of a bowtie and could be cut in a meetpoint manner. This is the result - I'm still not 100% happy with it, but Nick Fabri (one of my test cutters) loved it and I trust his judgment. Designed for topaz but works in materials from beryl to peridot (RI = 1.58 - 1.65) and can be scaled well for higher RIs.

Wireframe

Pseudo-Radiant 1.25 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
9648
Set stone width.
G290.00°
12366084
Level girdle.
G390.00°
2472
Meet P6, P7, G2
P467.85°
9648
Meet P2, P3
P1067.85°
2472
Level girdle.
P342.32°
 2465094
Meet P1, P2
P742.22°
17316579
Meet P1, P5, P6
P641.92°
12366084
Meet P1, P5
P841.83°
23257173
Meet P1, P5, P6, P7
P241.83°
9648
Meet at culet.
P541.00°
 6425490
Meet P1, P3. P4
P140.58°
 5435391
Cut to centerpoint.

Crown

#AngleFacetsNotes
C140.00°
9648
Set girdle width.
C240.00°
12366084
Level girdle.
C340.00°
2472
Level girdle.
C434.00°
 1474995
Meet G1, G2, C1, C2
C534.00°
23257173
Meet G2, G3, C2, C3
C832.26°
2472
Meet C3, C5
C630.00°
9648
Meet C1, C4
C717.00°
12366084
Meet C2, C4, C5
T0.00°
24
Meet C4, C6, C7; C5, C7, C8