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


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

Ojo Jeff Graham Facet Design

Ojo Jeff Graham Facet Design

Ojo (MC109.JRG)
By Jeff R. Graham
Copyright 2006
84.7% Light Return
Angles for R.I. = 1.62
125 facets + 16 facets on girdle = 141
2-fold, mirror-image symmetry
96 index
L/W = 1.172 T/W = 0.533 T/L = 0.455 P/W = 0.514
C/W = 0.188 H/W = (P+C)/W+0.02 = 0.722 P/H = 0.712 C/H = 0.261 Vol./W^3 = 0.315

Addition # 12 – Cut in refractive indexes 1.62 to 2.14 with no changes. This works best in light to medium saturations and is designed for a large stone.

Ojo 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.