Faceting Design Diagram: Glitter Mine #2 – Tourmaline, Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Glitter Mine2_jeff_graham_facet_design1

Glitter Mine2_jeff_graham_facet_design2

Glitter Mine #2 (MC89.JRG)
By Jeff R. Graham
Copyright 2003
87.6% Light Return
Angles for R.I. = 1.62
129 facets + 8 facets on girdle = 137
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.474 T/L = 0.474 P/W = 0.508
C/W = 0.188 H/W = (P+C)/W+0.02 = 0.717 P/H = 0.709 C/H = 0.263 Vol./W^3 = 0.297

Addition # 12 – Cut in refractive indexes 1.62 to 2.14 with no changes. This works well in light to medium saturated material and needs to be a large stone. Rough in the table before cutting the star facets makes the meet easier.

Glitter Mine#2 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.