Faceting Design Diagram: Rhomboid Split – Feldspar – Bytonite, Labradorite, Spectrolite, Orthoclase


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

Rhomboid Split Jeff Graham Facet Design

Rhomboid Split Jeff Graham Facet Design

Rhomboid Split (SUN28.JRG)
By Jeff R. Graham
Copyright 2006
90.6% Light Return
Angles for R.I. = 1.54
13 facets + 4 facets on girdle = 17
2-fold symmetry
96 index
L/W = 3.000 T/W = 0.917 T/L = 0.306 P/W = 0.450
C/W = 0.175 H/W = (P+C)/W+0.02 = 0.645 P/H = 0.698 C/H = 0.271 Vol./W^3 = 1.046

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for long skinny-colored material and will work in gold as well. This is basically a reflector and easy to cut. The L/W is not critical.

Rhomboid Split 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.