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

Nadir (MIR82.JRG)
By Jeff R. Graham
Copyright 2005
87.1% Light Return
Angles for R.I. = 1.62
36 facets + 12 facets on girdle = 48
4-fold, mirror-image symmetry
96 index
L/W = 1.000 P/W = 0.423 C/W = 0.222
H/W = (P+C)/W+0.02 = 0.665 P/H = 0.636 C/H = 0.333
Vol./W^3 = 0.245

Addition # 10 - This is quick and easy. The cross on the bottom can be varied depending on how deep you cut the tier. This is not hard to cut and is a bit different. Light to medium saturation is best. Cut in refractive indexes 1.62 to 2.14 with no changes.

 

 

 

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