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

Ojo (MC109.JRG)
By Jeff R. Graham
Copyright 2006
84.7% Light Return
Angles for R.I. = 1.62
125 facets + 16 facets on girdle = 141
2-fold, mirror-image symmetry
96 index
L/W = 1.172 T/W = 0.533 T/L = 0.455 P/W = 0.514
C/W = 0.188 H/W = (P+C)/W+0.02 = 0.722 P/H = 0.712 C/H = 0.261 Vol./W^3 = 0.315

Addition # 12 - Cut in refractive indexes 1.62 to 2.14 with no changes. This works best in light to medium saturations and is designed for a large stone.

 

 

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