Faceting Design Diagram: Glitter 88 – Tourmaline, Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Glitter 88 Jeff Graham Facet Design Glitter 88 Jeff Graham Facet Design

Glitter 88 (MC90.JRG)
By Jeff R. Graham
Copyright 2003
81.3% Light Return
Angles for R.I. = 1.62
121 facets + 8 facets on girdle = 129
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.482 T/L = 0.482 P/W = 0.466
C/W = 0.209 H/W = (P+C)/W+0.02 = 0.695 P/H = 0.671 C/H = 0.300 Vol./W^3 = 0.258

Addition # 12 – Cut in refractive indexes 1.62 to 2.14 (90.5%) with no changes. This works well in light to medium saturated materials. Rough in the table and then cut the stars, it make the meets easier.

Glitter 88_jeff_graham_facet_design3

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.