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

Kalli (DOME2.JRG)
By Jeff R. Graham
Copyright 2007
80.6% Light Return
Angles for R.I. = 1.62
169 facets + 16 facets on girdle = 185
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.263 T/L = 0.263 P/W = 0.397
C/W = 0.466 H/W = (P+C)/W+0.02 = 0.883 P/H = 0.450 C/H = 0.528 Vol./W^3 = 0.342

Addition # 13 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is not hard to cut, but it is time consuming and needs to be cut in a large stone. Light color and saturation is best. This is made to be bezel set which is why the C1 is a large as it is.

 

 

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