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


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

Double Rose Jeff Graham Facet Design 1

Double Rose Jeff Graham Facet Design 2

Double Rose (DOME27.JRG)
By Jeff R. Graham
Copyright 2007
81% Light Return
Angles for R.I. = 1.62
121 facets + 8 facets on girdle = 129
16-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.319 T/L = 0.319 P/W = 0.438 C/W = 0.391
H/W = (P+C)/W+0.02 = 0.849 P/H = 0.516 C/H = 0.460
Vol./W^3 = 0.330

Addition # 13 -Cut this in refractive indexes 1.62 to 2.14 with no changes. This is designed for light saturated color and a large stone is best. This is not hard to cut, other than is has a lot of facets.

Double Rose Jeff Graham Facet Design 3

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.