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

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

Rose Jeff Graham Facet Design 1 Rose Jeff Graham Facet Design 2

Rose (DOME24.JRG)
By Jeff R. Graham
Copyright 2007
86.1% Light Return
Angles for R.I. = 1.62
57 facets + 8 facets on girdle = 65
8-fold symmetry
96 index
L/W = 1.000 T/W = 0.184 T/L = 0.184 P/W = 0.405 C/W = 0.418
H/W = (P+C)/W+0.02 = 0.843 P/H = 0.480 C/H = 0.496
Vol./W^3 = 0.315

Addition # 13 – Cut this in refractive indexes 1.62 to 2.14 with no changes. This is simple to cut and makes a very interesting design. I designed this for pale to light saturated material.

Champange Tourmaline

 

 Rose Jeff Graham Facet Design 3

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.