Faceting Design Diagram: N-Star – Garnet – Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite


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

N-Star (GNETP9.JRG) 2.55 carat Rhodolite
By Jeff R. Graham
Copyright 1993
92.6% Light Return
Angles for R.I. = 1.73
61 facets + 8 facets on girdle = 69
4-fold, mirror-image symmetry
96 index
L/W = 1.000
T/W = 0.408 T/L = 0.408
P/W = 0.371 C/W = 0.185
H/W = (P+C)/W+0.02 = 0.576
P/H = 0.644 C/H = 0.321
Vol./W^3 = 0.201

Gram Book 1 – This design is a little more complicated to cut, and works well with dark to medium material, 1-5ct. It’s cut a little shallow to help lighten dark material. This is a classic shape and works well 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.