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

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

Crush (B36.JRG)Danburite cut by Tony Carson
By Jeff R. Graham
Copyright 2001
88.1% Light Return
Angles for R.I. = 1.62
51 facets + 10 facets on girdle = 61
2-fold, mirror-image symmetry
96 index
L/W = 1.396 T/W = 0.921 T/L = 0.660
P/W = 0.586 C/W = 0.169
H/W = (P+C)/W+0.02 = 0.774
P/H = 0.756 C/H = 0.218
Vol./W^3 = 0.451

Addition # 5 – This needs a preform, but does not have a lot of facets and cuts pretty fast. It is really a “Money Cut”… This works in R.I. 1.62 to 1.93 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.