Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Odd Round n' Round (TLINE1.JRG)
By Jeff R. Graham
Copyright 1993
83.4% Light Return
Angles for R.I. = 1.62
129 facets + 16 facets on girdle = 145
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.489 T/L = 0.489
P/W = 0.426 C/W = 0.157
H/W = (P+C)/W+0.02 = 0.603
P/H = 0.707 C/H = 0.260
Vol./W^3 = 0.217

Addition # 2 - This design is for light to med material, 1-16cts. It has a nice uneven sparkle in every direction and is fun to cut because of it's odd symmetry. Cut in refractive indexes 1.54 to 2.14 (91.4%) with no changes.

 

 

 

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