Trig: Faceting Design Diagram
Successful tips, details and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Trig".
By Jeff R. Graham
83.7% Light Return
Angles for R.I. = 1.54
52 facets + 12 facets on girdle = 64
3-fold, mirror-image symmetry
L/W = 1.013 T/W = 0.239 T/L = 0.236
P/W = 0.391 C/W = 0.199
H/W = (P+C)/W+0.02 = 0.609
P/H = 0.641 C/H = 0.326
Vol./W^3 = 0.192
Addition # 6 - Notice that the crown on this design is deep to help darken light colored material. The only light loss is at the edge of the girdle, where prongs will cover it.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
Rose Quartz Value, Price, and Jewelry Information
Ametrine Value, Price, and Jewelry Information
Amethyst Value, Price, and Jewelry Information
Citrine Value, Price, and Jewelry Information
Creating Ring Mountings for Deep-Cut Gemstones
How Does Topaz Form?
Prosopite Value, Price, and Jewelry Information
Gemstone Doublets, Triplets, and Other Assembled Stones
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
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!