Athena: 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 "Athena".
Sunstone (Feldspar, Bytonite, Labradorite, Spectrolite, Orthoclase)
By Jeff R. Graham
86.1% Light Return
Angles for R.I. = 1.54
27 facets + 6 facets on girdle = 33
2-fold, mirror-image symmetry
L/W = 1.500 T/W = 1.232 T/L = 0.821 P/W = 0.450
C/W = 0.171 H/W = (P+C)/W+0.02 = 0.642 P/H = 0.702 C/H = 0.267 Vol./W^3 = 0.471
Addition # 11 - Cut this in refractive indexes 1.54 to 2.14 with no changes. This is very nice and designed for color, it is great in Aquamarine and Tourmaline. This is not hard to cut but can be a little tricky. Note: The C4 cuts to make C3 a pointed diamond. Expect to have to tweak the crown.
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.
Bytownite Value, Price, and Jewelry Information
Orthoclase Value, Price, and Jewelry Information
Feldspar Value, Price, and Jewelry Information
Labradorite Value, Price, and Jewelry Information
Gemology Book Reviews: Careers
Augelite Value, Price, and Jewelry Information
Six Famous Aquamarines
Risk Management and Gem Buying for Profit
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!