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