Still More Checkers

by Arya Akhavan (March 2015)
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Gemology Projectopen
L/W
100%
Design RI
1.50
H/W
73%
Gear
96
V/W³
0.267
Symmetry
4 (mirrored)
Facets
93
Tiers
16
Crown
45
Pavilion
28

I can't believe that I hadn't written a 5x5 square checkerboard before. Sure, I've done some things with 5x5 checkerboards in them, but not a pure checkerboard by itself. I tried to make this as even of a dome as possible. If you really want, you can re-write the pavilion as a pseudo-barion. Works in materials from petalite to CZ (RI = 1.50 - 2.16) with no changes. For dark garnets, make the pavilion even shallower and it should work.

Wireframe

Still More Checkers 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
96244872
Set stone size.
G290.00°
 321274551697593
Level girdle.
G390.00°
 519294353677791
Level girdle.
P144.17°
96244872
Cut to centerpoint.
P243.81°
 321274551697593
Meet at culet.
P443.51°
 222264650707494
Meet P1, P2, G1, G2
P343.00°
 519294353677791
Meet at culet.

Crown

#AngleFacetsNotes
C354.17°
 519294353677791
Level girdle.
C252.80°
 321274551697593
Level girdle.
C152.27°
96244872
Set girdle width.
C432.20°
12366084
Meet G3, C3
C527.21°
 816324056648088
Meet C2, C3, C4
C624.00°
96244872
Meet C1, C2, C5
C719.98°
12366084
Meet C4, C5
C814.42°
96244872
Meet C5, C6, C7
T0.00°
24
Meet C7, C8