Birdie: Faceting Design Diagram
Detailed information and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Birdie".
Garnet (Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite)
Birdie (CHECK75.JRG)
By Jeff R. Graham
Copyright 2003
84.3% Light Return
Angles for R.I. = 1.73
41 facets + 14 facets on girdle = 55
2-fold, mirror-image symmetry
96 index
L/W = 1.250 T/W = 0.292 T/L = 0.234
P/W = 0.455 C/W = 0.215
H/W = (P+C)/W+0.02 = 0.690
P/H = 0.659 C/H = 0.312
Vol./W^3 = 0.294
Addition # 8 - I designed this for a Mali Garnet, but it works well in any Garnet.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
Jeff R. Graham
The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as Gram Faceting Designs.
Related Articles
Garnet Value, Price, and Jewelry Information
How Do Garnets Form?
Garnet Symbolism
Top Spots for Gem Hunting in the US
Latest Articles
Basic Business Rules: Buying Rough
Peridot Value, Price, and Jewelry Information
Traditional Diamond Cut Grading Methods
Cutting a 294-ct Trilliant Morganite: An Interview with Steve Moriarty
Never Stop Learning
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
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!