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