Bygone Era: 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 "Bygone Era".
Sunstone (Feldspar, Bytonite, Labradorite, Spectrolite, Orthoclase)
Bygone Era (SUN26.JRG)
By Jeff R. Graham
Copyright 2006
80.6%Light Return
Angles for R.I. = 1.54
57 facets + 8 facets on girdle = 65
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.489 T/L = 0.489 P/W = 0.697
C/W = 0.206 H/W = (P+C)/W+0.02 = 0.923 P/H = 0.755 C/H = 0.223 Vol./W^3 = 0.391
PAVILION
CROWN
Addition # 11 - Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for light colored rough, and is very good in Aquamarine. This is fairly fast and easy to cut. This can be cut to the girdle instead of center point to save rough.
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
Bytownite Value, Price, and Jewelry Information
Orthoclase Value, Price, and Jewelry Information
Feldspar Value, Price, and Jewelry Information
Labradorite Value, Price, and Jewelry Information
Latest Articles
Creating Ring Mountings for Deep-Cut Gemstones
How Does Topaz Form?
Prosopite Value, Price, and Jewelry Information
Gemstone Doublets, Triplets, and Other Assembled Stones
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!