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

Signature #6 (CHECK5.JRG)
By Jeff R. Graham
Copyright 2000
86.4% Light Return
Angles for R.I. = 1.62
48 facets + 18 facets on girdle = 66
2-fold, mirror-image symmetry
96 index
L/W = 1.304 P/W = 0.518 C/W = 0.292
H/W = (P+C)/W+0.02 = 0.830
P/H = 0.624 C/H = 0.352
Vol./W^3 = 0.402

Addition # 6 - This is not easy to cut, but it makes a very nice stone and works well in darker materials. This top will take some cheating to get it lined up which is normal for checkers. This works in refractive indexes 1.62 to 1.93 with no changes.

 

 

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