Equivalent Exchange

by Arya Akhavan (March 2013)
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Gemology Projectopen
L/W
111%
Design RI
1.62
H/W
65%
Gear
96
V/W³
0.257
Symmetry
2 (mirrored)
Facets
62
Tiers
18
Crown
26
Pavilion
36

All I wanted for this design was a 3 by 4 checkerboard, but for some reason any change on one side would result in an opposite tweak on the other side, for maintaining the squares and light output, hence the name. Works in materials from tourmaline to GGG (RI = 1.62 - 2.03) with no changes, and looks hallucinogenic in CZ. Suggested length = 7-12 mm

Wireframe

Equivalent Exchange 3D view
Top viewSide viewFront viewBack view

Pavilion

#AngleFacetsNotes
G190.00°
 2465094
Set stone width.
G290.00°
 6425490
Level girdle.
G390.00°
20286876
Level girdle.
G490.00°
2472
Level girdle.
P342.82°
 2465094
Meet at culet.
P441.40°
 4445292
Meet P1, P3, G1, G2
P141.14°
 6425490
Cut to centerpoint.
P640.10°
2472
Meet P2, P5
P239.01°
20286876
Meet at culet.
P538.03°
19296777
Meet P1, P2, G2, G3; culet

Crown

#AngleFacetsNotes
C353.09°
20286876
Level girdle.
C452.13°
2472
Level girdle.
C238.30°
 6425490
Level girdle.
C136.35°
 2465094
Set girdle width.
C524.63°
11375985
Meet G2, G3, C2, C3
C619.36°
 3455193
Meet C1, C2, C5
C716.82°
2472
Meet C3, C4, C5
C83.92°
2472
Meet C5, C6, C7