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

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

Gambler (CHECK38.JRG)
By Jeff R. Graham
Copyright 2001
91.6% Light Return
Angles for R.I. = 1.62
65 facets + 16 facets on girdle = 81
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.298 T/L = 0.298
P/W = 0.405 C/W = 0.229
H/W = (P+C)/W+0.02 = 0.654
P/H = 0.619 C/H = 0.350
Vol./W^3 = 0.211

Addition # 6 – Cut this in any refractive index with no changes. This makes a nice round, especially in a large size so that the diamonds on the crown can be seen.


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.