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


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

Straight Sides (GNETP30A.JRG)
By Jeff R. Graham
Copyright 1996
80% Light Return
Angles for R.I. = 1.73
45 facets + 10 facets on girdle = 55
2-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.959 T/L = 0.721
P/W = 0.414 C/W = 0.145
H/W = (P+C)/W+0.02 = 0.579
P/H = 0.715 C/H = 0.250
Vol./W^3 = 0.310

Gram Book 1 – This design cuts fast and mid-easy for an oval. The P7-P9 can be cut in another order if you want. It has nice flash and is good for darker material, 1-8cts. Works in man-made Sapphire and Spinel.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler