Faceting Design Diagram: Deva – Sunstone – Feldspar, Bytonite, Labradorite, Spectrolite, Orthoclase


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

Deva Jeff Graham Facet Design

Deva Jeff Graham Facet Design

Deva (SUN21.JRG)
By Jeff R. Graham
Copyright 2006
77.3% Light Return
Angles for R.I. = 1.54
46 facets + 5 facets on girdle = 51
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.375 T/L = 0.356 P/W = 0.501
C/W = 0.225 H/W = (P+C)/W+0.02 = 0.746 P/H = 0.672 C/H = 0.301 Vol./W^3 = 0.278

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for clear or pale colors. It works well in about any lightly saturated material. I like it in Aquamarine. 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.

Deva 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.