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