Checker Obsession

by Arya Akhavan (May 2014)
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Gemology Projectopen
L/W
100%
Design RI
1.54
H/W
66%
Gear
96
V/W³
0.241
Symmetry
4 (mirrored)
Facets
89
Tiers
17
Crown
49
Pavilion
24

I've been slowly uploading my new designs to the Gemology Project, and seeing all the triangle checkers made me want to write up a square checker with a broad spread. Unfortuntely squares are much harder to work with. Works in materials from feldspar to rutile (RI = 1.52 - 2.62) with no changes, but I prefer orange lab corundum. Suggested size = 8-15 mm

Wireframe

Checker Obsession 3D view
Top viewSide viewFront viewBack view

Pavilion

#AngleFacetsNotes
G190.00°
96244872
Set stone size.
G290.00°
 321274551697593
Level girdle.
G390.00°
12366084
Level girdle.
P142.70°
96244872
Cut to centerpoint.
P242.50°
 321274551697593
Meet at culet.
P441.67°
12366084
Meet P2, P3
P341.50°
 222264650707494
Meet P1, P2, G1, G2

Crown

#AngleFacetsNotes
C346.60°
12366084
Level girdle.
C241.00°
 321274551697593
Level girdle.
C140.45°
96244872
Set girdle width.
C438.29°
 519294353677791
Meet G2, G3, C2, C3
C519.75°
12366084
Meet C3, C4
C616.97°
 915333957638187
Meet C2, C4, C5
C714.24°
96244872
Meet C1, C2, C6
C813.49°
12366084
Meet C5, C6
C99.63°
96244872
Meet C6, C7, C8
T0.00°
24
Meet C8, C9