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

Scanner (MIR58.JRG)
By Jeff R. Graham
Copyright 2005
87.8% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
4-fold, mirror-image symmetry
72 index
L/W = 1.000 T/W = 0.363 T/L = 0.363 P/W = 0.421
C/W = 0.221 H/W = (P+C)/W+0.02 = 0.662 P/H = 0.636 C/H = 0.334 Vol./W^3 = 0.246

Addition # 10 - This cuts a little harder than it may look, especially if the stone is small. The C3,C4 tiers are delicate. This works well in light to medium saturated materials. Cut in refractive indexes 1.62 to 2.14 with no changes.

 

 

 

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