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

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

Glitter Eight Jeff Graham Facet Design

Glitter eight_jeff_graham_facet_design2

Glitter Eight (MC88.JRG)
By Jeff R. Graham
Copyright 2003
86.6% Light Return
Angles for R.I. = 1.62
129 facets + 8 facets on girdle = 137
16-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.406 T/L = 0.406 P/W = 0.435
C/W = 0.196 H/W = (P+C)/W+0.02 = 0.651 P/H = 0.669 C/H = 0.301 Vol./W^3 = 0.219

Addition # 12 – This is easy and straight forward to cut, although it should be cut in a large stone because it has a lot of facets. I like it in light to medium colored material. Cut in refractive index 1.62 to 2.14 (87.3%)with no changes.

Glitter eight_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.