Faceting Design Diagram: Sun Rays – Feldspar – Bytonite, Labradorite, Spectrolite, Orthoclase


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

Sun Rays Jeff Graham Facet Design

Sun Rays Jeff Graham Facet Design

Sun Rays (SUN36.JRG)
By Jeff R. Graham
Copyright 2006
87.2% Light Return
Angles for R.I. = 1.54
22 facets + 10 facets on girdle = 32
2-fold, mirror-image symmetry
96 index
L/W = 2.000 P/W = 0.450 C/W = 0.196
H/W = (P+C)/W+0.02 = 0.667 P/H = 0.675 C/H = 0.295 Vol./W^3 = 0.543

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is for very shallow material. It will work well in about any material. Note: P3(G), P4(G) are equal in size. The crown may take a little tweaking to make center point.

Sun Rays 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.