Faceting Design Diagram: Spin ‘ in Around 2 – Garnet – Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite


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

Spin ‘ in Around 2 (GNETR.JRG)
By Jeff R. Graham
Copyright 1994
87.6% Light Return
Angles for R.I. = 1.73
81 facets + 8 facets on girdle = 89
8-fold symmetry
96 index
L/W = 1.000 T/W = 0.547 T/L = 0.547
P/W = 0.382 C/W = 0.150
H/W = (P+C)/W+0.02 = 0.552
P/H = 0.692 C/H = 0.272
Vol./W^3 = 0.180

Gram Book 1 – Be very careful cutting C4, once you cut the first facet on the tier, you will not have any more meets, so make sure that all of the facets are the same size so they meet the table. Light to medium material, 1- 6cts. Works in man made Sapphire and Spinel. Cut in refractive indexes 1.73 to 2.14 with no changes. In 2.14 there is a lot of dispersion…


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler