Faceting Design Diagram: Not – Tourmaline, Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Jeff Graham Faceting Design Jeff Graham Faceting Design

Not (MIR70.JRG)
By Jeff R. Graham
Copyright 2005
92.2% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
8-fold, mirror-image symmetry
80 index
L/W = 1.000 T/W = 0.396 T/L = 0.396 P/W = 0.426
C/W = 0.204 H/W = (P+C)/W+0.02 = 0.650 P/H = 0.655 C/H = 0.314 Vol./W^3 = 0.230

Addition # 10 – This is easy to cut, but needs to be in a large size,10mm and up. The amount of Mirage reflections in this design are amazing. I designed this to be a fast way to cut large stone. This is “Not” what you think, and it can be a little harder to cut than may think. The P3 tier is a bit difficult depending on the stone size.

Jeff Graham Faceting Design

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.