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


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

Jeff Graham Facet Design

Jeff Graham Facet Design

Nadir (MIR82.JRG)
By Jeff R. Graham
Copyright 2005
87.1% Light Return
Angles for R.I. = 1.62
36 facets + 12 facets on girdle = 48
4-fold, mirror-image symmetry
96 index
L/W = 1.000 P/W = 0.423 C/W = 0.222
H/W = (P+C)/W+0.02 = 0.665 P/H = 0.636 C/H = 0.333
Vol./W^3 = 0.245

Addition # 10 – This is quick and easy. The cross on the bottom can be varied depending on how deep you cut the tier. This is not hard to cut and is a bit different. Light to medium saturation is best. Cut in refractive indexes 1.62 to 2.14 with no changes.

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.