Faceting Design Diagram: Icon Square – Garnet – Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite


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

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.