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

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.