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

Nifty Swifty (CHECK61.JRG)
By Jeff R. Graham
Copyright 2003
88.1% Light Return
Angles for R.I. = 1.62
41 facets + 8 facets on girdle = 49
2-fold, mirror-image symmetry
96 index
L/W = 1.500 T/W = 0.495 T/L = 0.330
P/W = 0.437 C/W = 0.172
H/W = (P+C)/W+0.02 = 0.629
P/H = 0.694 C/H = 0.274
Vol./W^3 = 0.345

Addition # 8 - This works well in almost any Tourmaline. You may need to adjust the crown a bit depending on how you cut in C6. Hint: Leave C3 at a higher angle, cut the crown and then take up the slack if any.

 

 

 

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