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


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

Wit Jeff Graham Facet Design

Wit Jeff Graham Facet Design

Wit (SUN10.JRG)
By Jeff R. Graham
Copyright 2006
80.3% Light Return
Angles for R.I. = 1.54
49 facets + 12 facets on girdle = 61
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.514 T/L = 0.514 P/W = 0.466
C/W = 0.202 H/W = (P+C)/W+0.02 = 0.688 P/H = 0.678 C/H = 0.293 Vol./W^3 = 0.295

 

Addition # 11 – Cut this in refractive indexes 1.54 to 2.14 with no changes. The C1,C2 steps on the crown can be omitted for thin rough. This is designed for light to medium color and is a reflector, which will help get more light into the stone and prevent color mixing. Note: The P3(G) girdle facets just float, cut them as close as you can to the diagram. They are not critical.

Wit 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.