Faceting Design Diagram: Twist on “CH” – Garnet – Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite

Garnet (Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite)

Twist on “CH” (GNETA5.JRG)
By Jeff R. Graham
Copyright 1997
78% Light Return
Angles for R.I. = 1.73
32 facets + 8 facets on girdle = 40
4-fold symmetry
96 index
L/W = 1.000 P/W = 0.446 C/W = 0.229
H/W = (P+C)/W+0.02 = 0.695
P/H = 0.641 C/H = 0.330
Vol./W^3 = 0.256

Addition # 2 – This is a nice change and is simple to cut. It is a little different twist on one of my early designs that a lot of cutters have told me they wanted more of. Cut in lighter material, 1/2-6cts. This works well in man-made Sapphire, YAG, and Spinel.

Random – Cosine – ISO

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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