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

Pulled Four (B21.JRG)
By Jeff R. Graham
Copyright 2000
85.8% Light Return
Angles for R.I. = 1.62
47 facets + 8 facets on girdle = 55
2-fold, mirror-image symmetry
96 index
L/W = 1.159 T/W = 0.491 T/L = 0.423
P/W = 0.487 C/W = 0.240
H/W = (P+C)/W+0.02 = 0.747
P/H = 0.652 C/H = 0.321
Vol./W^3 = 0.285

Addition # 5 - This is a good design for light colored material and works well in Sapphire (84.2%), Peridot, Topaz, Tourmaline, Spinel, Garnet... Watch your L/W, if you are off the crown will need adjustments.

 

 

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