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


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

Trapper Check (CHECK7.JRG) Tourmaline
By Jeff R. Graham
Copyright 2001
81.7% Light Return
Angles for R.I. = 1.62
27 facets + 8 facets on girdle = 35
2-fold symmetry
96 index
L/W = 1.160 T/W = 0.849 T/L = 0.731
P/W = 0.466 C/W = 0.179
H/W = (P+C)/W+0.02 = 0.665
P/H = 0.701 C/H = 0.269
Vol./W^3 = 0.378

Addition # 6 – This is an odd one… It can be adapted to almost any L/W and I originally designed it for a bi-color. This is not a standard shape for setting, but in most cases should not be a problem.


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.