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

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

Jeff Graham Faceting Design  Jeff Graham Faceting Design

Darhla (MIR76.JRG)
By Jeff R. Graham
Copyright 2005
91.4% Light Return
Angles for R.I. = 1.62
41 facets + 10 facets on girdle = 51
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.287 T/L = 0.273 P/W = 0.433 C/W = 0.238
H/W = (P+C)/W+0.02 = 0.691 P/H = 0.627 C/H = 0.344
Vol./W^3 = 0.217

Addition # 10 – Cut in refractive indexes 1.62 to 2.14 with no changes. This is very nice and works well in about any saturation. I tend to prefer light to medium saturated stones and I like it in Tourmaline. It is a great Topaz cut.

 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.