Faceting Design Diagram: Seagull Variation – Garnet – Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite

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

Seagull Variation (GNETP21.JRG)
By Jeff R. Graham
Copyright 1994
80.5% Light Return
Angles for R.I. = 1.73
52 facets + 6 facets on girdle = 58
3-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.576 T/L = 0.499
P/W = 0.416 C/W = 0.200
H/W = (P+C)/W+0.02 = 0.636
P/H = 0.655 C/H = 0.314
Vol./W^3 = 0.263

Addition # 2 – This design takes a little thinking to cut because of the 3-sym facets that are used (the crown in particular). However, it does not have a lot of facets and can be cut fairly fast, 1-6cts light to medium material. This works in man-made Sapphire, YAG, 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.