Uso Da!

by Arya Akhavan (November 2012)
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Gemology Projectopen
L/W
132%
Design RI
1.72
H/W
84%
Gear
96
V/W³
0.409
Symmetry
2 (mirrored)
Facets
31
Tiers
10
Crown
9
Pavilion
22

I've cut Marco Voltolini's "Shouga" design in the past. It's one of the simplest possible barion checkerboards, but I took that as a challenge and wrote an even simpler one, with only 31 facets! (Designed for small stones.) Can be cut in materials from petalite to rutile (RI = 1.50 - 2.62) with no changes, but I like it in light purple spinel. Suggested length = 4-8 mm

Wireframe

Uso Da! 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
9648
Set stone width.
G290.00°
10385886
Meet P1, G1
G390.00°
2472
Meet P1, G2
P367.56°
9648
Level girdle.
P265.21°
10385886
Level girdle.
P143.27°
9615243348637281
Cut to centerpoint.

Crown

#AngleFacetsNotes
C239.75°
10385886
Level girdle.
C133.42°
9648
Set girdle width.
C326.86°
2472
Level girdle.
T0.00°
24
Meet C1, C2, C3