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


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

Pent Mod “R” (GNETP37.JRG)
By Jeff R. Graham
Copyright 1997
87.1% Light Return
Angles for R.I. = 1.73
66 facets + 10 facets on girdle = 76
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.468 T/L = 0.445
P/W = 0.436 C/W = 0.197
H/W = (P+C)/W+0.02 = 0.653
P/H = 0.668 C/H = 0.301
Vol./W^3 = 0.235

Addition # 2 – This design cuts easy, but watch how you cut the P6, P7. They alternate and both meet the P3 tier. This has a very nice flash, just about any Garnet will work, I prefer light colors. I like it in Rose Malaya Garnet, 1-6cts. Cut in refractive indexes 1.73 to 2.14 with no changes.


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.