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


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

Glow Jeff Graham Facet Design

Glow Jeff Graham Facet Design

Glow (SUN23.JRG)
By Jeff R. Graham
Copyright 2006
89.4% Light Return
Angles for R.I. = 1.54
36 facets + 10 facets on girdle = 46
5-fold, mirror-image symmetry
80 index
L /W = 1.051 T/W = 0.434 T/L = 0.412 P/W = 0.473
C/W = 0.222 H/W = (P+C)/W+0.02 = 0.715 P/H = 0.662 C/H = 0.310 Vol./W^3 = 0.275

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for moderately saturated watermelon rough. Notice the large reflector mains. This also works well in about any rough. Note: The girdle can be cut in first and the P1 cut to meet so that center point is not needed and it saves rough.

Glow 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.