Faceting Design Diagram: Baron’s Choice – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite

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

Baron’s Choice (CHECK25.JRG)
By Jeff R. Graham
Copyright 2001
90.4% Light Return
Angles for R.I. = 1.62
65 facets + 8 facets on girdle = 73
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.211 T/L = 0.211
P/W = 0.534 C/W = 0.238
H/W = (P+C)/W+0.02 = 0.793
P/H = 0.674 C/H = 0.301
Vol./W^3 = 0.390

Addition # 6 – The corners of this design are made to be adjustable, but ideally they should be large enough to take a setting prong. This stone is designed for a large 10mm and up stone. P5 may need to be floated in as the corners vary.


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.