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

Spice (CHECK68.JRG)
By Jeff R. Graham
Copyright 2003 91.4%
Light Return Angles for R.I. = 1.62
25 facets + 4 facets on girdle = 29
4-fold, mirror-image symmetry
96 index
L/W = 1.001 T/W = 0.486 T/L = 0.485
P/W = 0.466 C/W = 0.155
H/W = (P+C)/W+0.02 = 0.642
P/H = 0.727 C/H = 0.242
Vol./W^3 = 0.282

Addition # 8 - Cut this in refractive indexes 1.54 (90.1%) to 2.14 (91.4%) with no changes. This design tends to be bright and works well in any material. It's not tough to cut and is a good diamond checker choice for a novice.

 

 

 

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