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

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.