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


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

Ephemeral Jeff Graham Facet Design

Ephemeral Jeff Graham Facet Design

Ephemeral (SUN11.JRG)
By Jeff R. Graham
Copyright 2006
94.2% Light Return
Angles for R.I. = 1.54
33 facets + 8 facets on girdle = 41
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.193 T/L = 0.193 P/W = 0.466
C/W = 0.158 H/W = (P+C)/W+0.02 = 0.645 P/H = 0.723 C/H = 0.246 Vol./W^3 = 0.218

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for thin good-colored rough and/or shiller. This is very bright and, if cutting in heavy shiller, be sure the flash is 90 degrees to crown. This is also excellent in saturated Garnets.

Ephemeral Jeff Graham Facet Design

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

About the author
Jeff R. Graham
The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as Gram Faceting Designs.
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