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

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

Shutter Jeff Graham Facet Design 1 Shutter Jeff Graham Facet Design 2

Shutter (DOME26.JRG)
By Jeff Graham
Copyright 2007
82.4 % Light Return
Angles for R.I. = 1.62
65 facets + 8 facets on girdle = 73
8-fold symmetry
96 index
L/W = 1.000 T/W = 0.211 T/L = 0.211 P/W = 0.415 C/W = 0.315
H/W = (P+C)/W+0.02 = 0.750 P/H = 0.553 C/H = 0.420
Vol./W^3 = 0.259

Addition # 13 – Cut in refractive indexes 1.62 to 2.14 with no changes. This is designed for light saturated rough, and is best cut in a large stone. The light flash is very interesting and this is pretty unique.

Shutter 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.