Faceting Design Diagram: Ten Seagulls – Garnet – Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite


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

Ten Seagulls (GNETP20.JRG)
By Jeff R. Graham
Copyright 1994 83.8%
Light Return Angles for R.I. = 1.73
46 facets + 6 facets on girdle = 52
3-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.522 T/L = 0.452
P/W = 0.416 C/W = 0.229
H/W = (P+C)/W+0.02 = 0.665
P/H = 0.626 C/H = 0.344
Vol./W^3 = 0.273

Gram Book 1 – This design is a little harder to cut than it looks like, but it cuts fairly fast and makes a nice 1-4 ct stone in most to light medium material. Cut in refractive index 1.73 to 1.93 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.