Faceting Design Diagram: Sliver – Feldspar – Bytonite, Labradorite, Spectrolite, Orthoclase


Sunstone (Feldspar, Bytonite, Labradorite, Spectrolite, Orthoclase)

Sliver Jeff Graham Facet Design

Sliver Jeff Graham Facet Design

Sliver (SUN9.JRG)
By Jeff R. Graham
Copyright 2006
84.6% Light Return
Angles for R.I. = 1.54
23 facets + 6 facets on girdle = 29
2-fold, mirror-image symmetry
96 index
L/W = 1.500 T/W = 1.148 T/L = 0.765 P/W = 0.450
C/W = 0.132 H/W = (P+C)/W+0.02 = 0.602 P/H = 0.748 C/H = 0.219 Vol./W^3 = 0.284

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for those pieces of rough that have color on the thin edge. This works well in about any color and because of the keel it’s good for dichroiac material.

Sliver 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.