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


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

Almost (CHECK78.JRG)
By Jeff R. Graham
Copyright 2003
89.4% Light Return
Angles for R.I. = 1.62
49 facets + 12 facets on girdle = 61
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.350 T/L = 0.350
P/W = 0.383 C/W = 0.205
H/W = (P+C)/W+0.02 = 0.608
P/H = 0.631 C/H = 0.337
Vol./W^3 = 0.186

Addition # 8 – Cut this in refractive indexes 1.62 to 2.14 with no changes. This design is not quite round but it will fit in a round setting. It looks interesting when cut. This works well in about any material.


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.