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

Passion (DOME39.JRG)
By Jeff R. Graham
Copyright 2007
86.7% Light Return
Angles for R.I. = 1.62
56 facets + 10 facets on girdle = 66
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.172 T/L = 0.164 P/W = 0.405 C/W = 0.305
H/W = (P+C)/W+0.02 = 0.730 P/H = 0.554 C/H = 0.418
Vol./W^3 = 0.246

Addition # 13 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is a bit different and cuts a very pretty stone. It works well in light to medium saturated material and I like it in pink Tourmaline.

 

 

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