Garnet (Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite)
Icon Square (GNETP30.JRG)
By Jeff R. Graham
Copyright 1996
84.2% Light Return
Angles for R.I. = 1.73
77 facets + 12 facets on girdle = 89
1-fold symmetry
96 index
L/W = 1.000 T/W = 0.479 T/L = 0.479
P/W = 0.446 C/W = 0.235
H/W = (P+C)/W+0.02 = 0.701
P/H = 0.636 C/H = 0.335
Vol./W^3 = 0.276
Gram Book 1 – This design is standard to cut, but because of the number of facets it should be cut in a large size. Light material like Grossular Garnet works best, it will deepen color, 2-12cts. This works in man-made YAG,Sapphire and Spinel.
Random – Cosine – ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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.
