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

Lilac Lace (DOME14.JRG)
By Jeff R. Graham
Copyright 2007
86.7% Light Return
Angles for R.I. = 1.62
61 facets + 6 facets on girdle = 67
6-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.265 T/L = 0.230 P/W = 0.419
C/W = 0.266 H/W = (P+C)/W+0.02 = 0.705 P/H = 0.595 C/H = 0.377 Vol./W^3 = 0.256

Addition # 13 - Cut this in refractive indexes 1.62 to 2.14 with no changes. This works well in light to medium saturated stones. I like it in Rubellite and hot pink Tourmaline. The crown can take a bit of tweaking. NOTE: The C3 tier is just cut to eye and it can be varied slightly.

 

 

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