IGS Background

Ten Seagulls: Faceting Design Diagram


Helpful tips, details and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Ten Seagulls"

By Jeff R. Graham, updated on

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

Never Stop Learning

When you join the IGS community, you get trusted diamond & gemstone information when you need it.

Become a Member

Get Gemology Insights

Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!