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


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

Pogo Jeff Graham Facet Design 1

Pogo Jeff Graham Facet Design 2

Pogo (DOME5.JRG)
By Jeff R. Graham Copyright 2007
81.6% Light Return
Angles for R.I. = 1.62
97 facets + 16 facets on girdle = 113
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.314 T/L = 0.314 P/W = 0.405
C/W = 0.313 H/W = (P+C)/W+0.02 = 0.738 P/H = 0.549 C/H = 0.424 Vol./W^3 = 0.250

Addition # 13 – This is ideal for lightly saturated materials and is designed to be cut in a large size, say 10mm and up. Cut in refractive indexes 1.62 to 2.14 with no changes. This is fairly easy to cut.

Pogo 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.