Faceting Design Diagram: Diamond Eye 2.0 – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Diamond Eye 2.0 (CHECK83.JRG)
By Jeff R. Graham
Copyright 2003
75.3% Light Return
Angles for R.I. = 1.62
39 facets + 12 facets on girdle = 51
2-fold, mirror-image symmetry
96 index
L/W = 2.033 T/W = 0.458 T/L = 0.225
P/W = 0.415 C/W = 0.197
H/W = (P+C)/W+0.02 = 0.632
P/H = 0.657 C/H = 0.311
Vol./W^3 = 0.336

Addition # 8 – The light return on this is pretty good for a marquise. This works well in about any material, particularly medium saturated colored stones.


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.