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


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

Sun Flash Jeff Graham Facet Design

Sun Flash Jeff Graham Facet Design

Sun Flash (SUN41.JRG)
By Jeff R. Graham
Copyright 2006
83.9% Light Return
Angles for R.I. = 1.54
11 facets + 4 facets on girdle = 15
2-fold symmetry
96 index
L/W = 3.000 T/W = 2.833 T/L = 0.944 P/W = 0.450
C/W = 0.206 H/W = (P+C)/W+0.02 = 0.676 P/H = 0.665 C/H = 0.305 Vol./W^3 = 1.271

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for color/shiller and as the name implies, it’s basically for flash. Orientate the flash so it shows in the table. L/W is not critical.

Sun Flash 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.