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


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

Glitter Roval Jeff Graham Facet Design

Glitter Roval Jeff Graham Facet Design

 

Glitter Roval (MC97.JRG)
By Jeff R. Graham
Copyright 2006
90% Light Return
Angles for R.I. = 1.62
121 facets + 10 facets on girdle = 131
2-fold, mirror-image symmetry
96 index
L/W = 1.414 T/W = 0.475 T/L = 0.336 P/W = 0.598
C/W = 0.281 H/W = (P+C)/W+0.02 = 0.898 P/H = 0.665 C/H = 0.313 Vol./W^3 = 0.529

Addition # 12 – Cut in refractive indexes 1.62 to 2.14 with no changes. This is very nice and cuts well in about any light to mediumly saturated material. This is not a good design for a beginner. It works best in a large stone.

Glitter Roval_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.