Faceting Design Diagram: Point “R” – Garnet – Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite


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

Point “R” (GNETP27.JRG)
By Jeff R. Graham
Copyright 1995
81.1% Light Return
Angles for R.I. = 1.73
71 facets + 10 facets on girdle = 81
2-fold, mirror-image symmetry
96 index
L/W = 1.290 T/W = 0.833 T/L = 0.646
P/W = 0.454 C/W = 0.173
H/W = (P+C)/W+0.02 = 0.647
P/H = 0.701 C/H = 0.268
Vol./W^3 = 0.361

Gram Book 1 – This design is not easy, watch the P7-13 they can be a little tricky. They also could be cut in a different order if you want. P13 can be omitted on a small stone. The crown is mostly steps and they can be varied, but the table & C8 may need to be adjusted,1-14cts. This works in Sapphire and YAG.


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.