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


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

Imperial (GNETP24.JRG)
By Jeff R. Graham
Copyright 1995
85.2% Light Return
Angles for R.I. = 1.73
77 facets + 12 facets on girdle = 89
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.496 T/L = 0.496
P/W = 0.412 C/W = 0.212
H/W = (P+C)/W+0.02 = 0.644
P/H = 0.640 C/H = 0.329
Vol./W^3 = 0.281

Gram Book 1 – Make sure that the meets at C3,C4,C5 and the table (to be cut) are lined up. This design is a little hard to cut, but with a little work most cutters can handle it. Light material, like a Mali or Rose Malaya Garnet works best. This also works well in man-made Sapphires and Zircons.


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.