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


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

Pent Point (GNETP33.JRG)
By Jeff R. Graham
Copyright 1996
86.2% Light Return
Angles for R.I. = 1.73
51 facets + 5 facets on girdle = 56
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.537 T/L = 0.511
P/W = 0.424 C/W = 0.151
H/W = (P+C)/W+0.02 = 0.595
P/H = 0.713 C/H = 0.253
Vol./W^3 = 0.196

Gram Book 1 – Note 80 index. Easy to cut and fast. Good in about any material and shallow enough for darker material, 1-6cts. This is a nice change from a round brilliant and sells well. 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.