Zankoku

by Arya Akhavan (January 2013)
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Gemology Projectopen
L/W
128%
Design RI
1.54
H/W
73%
Gear
96
V/W³
0.262
Symmetry
4 (mirrored)
Facets
52
Tiers
18
Crown
18
Pavilion
34

I started with the side profile of an SRB, and decided to turn that into the girdle outline. By the time I was messing with the crown, I was frustrated. I sincerely hope you suffer while trying to hit all 5 meets on the table. Works in materials from feldspar to rutile (RI = 1.52 - 2.62) with no changes, but I like this in ST. Suggested width = 8-12 mm

Wireframe

Zankoku 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
96
Set stone size.
G290.00°
1482
Meet P1, G1
G390.00°
3660
Meet P1, G2
P672.31°
96
Level girdle.
P565.91°
1482
Level girdle.
P465.91°
3660
Level girdle.
P143.20°
 3 91521273339455157636975818793
Cut to centerpoint.
P742.00°
 618304254667890
Meet P1, P6 (only 4 facets meet)

Crown

#AngleFacetsNotes
C145.00°
96
Set girdle width.
C331.99°
3660
Level girdle.
C227.53°
1482
Level girdle.
C425.66°
1284
Meet G1, G2, C1, C2
C523.25°
3858
Meet G3, C3
C622.62°
3462
Meet G2, G3, C2, C3
C819.74°
3660
Meet C3, C5, C6
C716.74°
2472
Meet G2, G3, C2, C3, C6
C97.49°
1482
Meet C2, C4, C7; C6, C7, C8
T0.00°
24
Meet C1, C9; C5, C8; C6, C7, C8, C9