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


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

Repose Jeff Graham Facet Design

Repose Jeff Graham Facet Design

Repose (SUN20.JRG)
By Jeff R. Graham
Copyright 2006
87.4% Light Return
Angles for R.I. = 1.54
73 facets + 8 facets on girdle = 81
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.609 T/L = 0.609 P/W = 0.557
C/W = 0.141 H/W = (P+C)/W+0.02 = 0.718 P/H = 0.775 C/H = 0.197 Vol./W^3 = 0.296

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is excellent in about any colored material and works well in Beryl. It cuts fairly easy and fast I prefer lightly saturated materials. 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.

Repose 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.