Faceting Design Diagram: Crystal Keen Glitter – Tourmaline, Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite

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

Crystal Keen Glitter Jeff Graham Facet Design Crystal Keen Glitter Jeff Graham Facet Design

Crystal Keen Glitter (MC120.JRG)
By Jeff R. Graham
Copyright 2006
82.7% Light Return
Angles for R.I. = 1.62
103 facets + 15 facets on girdle = 118
3-fold, mirror-image symmetry
96 index
L/W = 1.030 T/W = 0.360 T/L = 0.350 P/W = 0.478
C/W = 0.204 H/W = (P+C)/W+0.02 = 0.702 P/H = 0.681 C/H = 0.291 Vol./W^3 = 0.260

Addition # 12 – Cut in refractive indexes 1.62 to 2.14 with no changes. This is designed for Tourmaline and works especially well in light to medium saturations. It is not too hard to cut and I like it in pink Tourmaline.

Crystal Keen Glitter Jeff Graham Facet 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.