Faceting Design Diagram: Crystal Star – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Crystal Star (B1.JRG)
By Jeff R. Graham
Copyright 2001
86% Light Return
Angles for R.I. = 1.62
52 facets + 6 facets on girdle = 58
3-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.484 T/L = 0.451
P/W = 0.442 C/W = 0.188
H/W = (P+C)/W+0.02 = 0.650
P/H = 0.680 C/H = 0.289
Vol./W^3 = 0.247

Addition # 5 – This will work in R.I. 1.62 to 1.76 with no changes. I prefer it in a medium to light colored Tourmaline, which is what the shape is designed for… It is fast and easy to cut, it is really a “Money Cut”.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.