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


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

Seagull Cut (GNETP19.JRG)
By Jeff R. Graham
Copyright 1994
78.7% Light Return
Angles for R.I. = 1.73
43 facets + 6 facets on girdle = 49
3-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.516 T/L = 0.447
P/W = 0.432 C/W = 0.222
H/W = (P+C)/W+0.02 = 0.674
P/H = 0.641 C/H = 0.329
Vol./W^3 = 0.265

Gram Book 1 – This cut is unusual because of the 3/3 split symmetry on the table. It cuts fast and makes a nice 13 ct. stone for earrings or rings. This works in man-made Sapphire and Spinel… Cut in refractive indexes 1.73 to 2.14 (81%) with no changes.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler