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

Cushion Triple Star (TLINE9.JRG)
By Jeff R. Graham
Copyright 1993
80.9% Light Return
Angles for R.I. = 1.62
89 facets + 16 facets on girdle = 105
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.539 T/L = 0.539
P/W = 0.449 C/W = 0.210
H/W = (P+C)/W+0.02 = 0.679
P/H = 0.662 C/H = 0.309
Vol./W^3 = 0.248

Gram Book 1 - This is a nice design for most any material and/or color. It cuts pretty fast and is not hard, yet it looks like it is involved to do, 1-16cts. Cut in refractive index 1.62 to 2.14 (83.9%) with no changes.

 

 

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