Imperial: Faceting Design Diagram

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