Faceting Design Diagram: Radiant Antique – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite

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

Radiant Antique (B30.JRG)
By Jeff R. Graham
Copyright 2001
92.5% Light Return
Angles for R.I. = 1.62
57 facets + 8 facets on girdle = 65
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.507 T/L = 0.507
P/W = 0.485 C/W = 0.179
H/W = (P+C)/W+0.02 = 0.684
P/H = 0.709 C/H = 0.262
Vol./W^3 = 0.256

Addition # 5 – This is very nice and it is designed to work in even a very small size stone. This is killer in any R.I. with no changes, including Quartz. I like it in Sapphire and use this design a lot. It cuts very fast and is really a “Money Cut”…

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.