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


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

Foxy (CHECK22.JRG)
By Jeff R. Graham
Copyright 2001
90.7% Light Return
Angles for R.I. = 1.62
53 facets + 8 facets on girdle = 61
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.196 T/L = 0.196
P/W = 0.449 C/W = 0.195
H/W = (P+C)/W+0.02 = 0.664
P/H = 0.676 C/H = 0.294
Vol./W^3 = 0.257

Addition # 6 – This design is very bright and works well in refractive indexes 1.62 to 1.93 with no changes. I like this design in about any material.


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.