Faceting Design Diagram: Color Spot – Feldspar – Bytonite, Labradorite, Spectrolite, Orthoclase


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

Color Spot Jeff Graham Facet Design

Color Spot Jeff Graham Facet Design

Color Spot (SUN15.JRG)
By Jeff R. Graham
Copyright 2006
93.7% Light Return
Angles for R.I. = 1.54
49 facets + 16 facets on girdle = 65
8-fold, mirror-image symmetry 96 index
L/W = 1.000 T/W = 0.329 T/L = 0.329 P/W = 0.457
C/W = 0.155 H/W = (P+C)/W+0.02 = 0.632 P/H = 0.723 C/H = 0.245 Vol./W^3 = 0.191

Addition # 11 – Cut this in refractive indexes 1.54 to 2.14 with no changes. This is fun to cut and is designed for color spots, surrounded by gold. Note: Place the color spot in the center of the pavilion and edge the C2 crown at the color line. It makes interesting effects and the color line can go on the tier line, past it or short of it. The effects will vary depending on where you line the tiers and colors. This works best in an 8mm stone or larger.

Color Spot 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.