Oppositional Defiance

by Arya Akhavan (April 2014)
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Gemology Projectopen
L/W
100%
Design RI
1.50
H/W
69%
Gear
96
V/W³
0.249
Symmetry
3 (mirrored)
Facets
79
Tiers
11
Crown
31
Pavilion
48

I recently saw a very nice matched pair of round bars by Doug Menadue, and that got me thinking. Could I have a round bar, AND a triangle, AND an opposed bar? Surprisingly enough, the answer was yes (mostly). Works in materials from petalite to CZ (RI = 1.50 - 2.16) with no changes, but I prefer yellow YAG (Ce:YAG). Suggested size = 7-15 mm

Wireframe

Oppositional Defiance 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
96 4 8121620242832364044485256606468727680848892
P555.42°
164880
Level girdle.
P453.25°
122044527684
Level girdle.
P347.56°
 82440567288
Level girdle.
P244.43°
 42836606892
Level girdle.
P143.44°
963264
Establish new girdle level; cut permanent culet.

Crown

#AngleFacetsNotes
C146.11°
 4 812162024283640444852566068727680848892
Set girdle width (include 16-48-80).
C240.32°
963264
Level girdle (overwrite extra C1 facets).
C330.97°
963264
Meet C1, C2
C417.26°
963264
Meet C1, C3
T0.00°
24
Meet C1, C4