Faceting Design Diagram: Signature #3 – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Signature #3 (B15.JRG)
By Jeff R. Graham
Copyright 2000
89.9% Light Return
Angles for R.I. = 1.62
77 facets + 12 facets on girdle = 89
2-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.870 T/L = 0.654
P/W = 0.612 C/W = 0.175
H/W = (P+C)/W+0.02 = 0.807
P/H = 0.759 C/H = 0.217
Vol./W^3 = 0.491

Addition # 5 – This is one of my favorite rectangle cushions to cut (that’s why it’s a Signature cut). It is well worth the trouble. This design is very bright, and I find that it works well in medium colored material. This cuts in R.I. 1.62 to 1.76 (87.5%) with no changes.


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.