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

5 Blossom (TLINE16.JRG)
By Jeff R. Graham
Copyright 1995
78% Light Return
Angles for R.I. = 1.62
86 facets + 10 facets on girdle = 96
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.532 T/L = 0.506
P/W = 0.468 C/W = 0.211
H/W = (P+C)/W+0.02 = 0.699
P/H = 0.669 C/H = 0.302
Vol./W^3 = 0.267

Addition # 1 - Note 80 index. It helps to rough in the table before you cut the C5 facets, that way it's easier to get things to meet. NOTICE 80 index, this design is a nice change and it will fit a standard mounting, any material, 1-8cts. Cut in refractive indexes 1.62 to 1.93 (83.4%) with no changes.

 

 

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