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


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

Angel Fire (B33.JRG)
By Jeff R. Graham
Copyright 2001
87.7% Light Return
Angles for R.I. = 1.62
61 facets + 8 facets on girdle = 69
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.527 T/L = 0.527
P/W = 0.497 C/W = 0.183
H/W = (P+C)/W+0.02 = 0.700
P/H = 0.711 C/H = 0.261
Vol./W^3 = 0.292

Addition # 5 – This cuts fast and is very bright. It works well in R.I. 1.62 to 1.93 with no changes. It should be cut in a decent sized stone because the crown facets are fairly small.

 


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.