Octagon Lace: Faceting Design Diagram
Tips, details, and a guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Octagon Lace".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Octagon Lace (MIR59.JRG)
By Jeff R. Graham
91% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
8-fold, mirror-image symmetry
L/W = 1.000 T/W = 0.246 T/L = 0.246 P/W = 0.438
C/W = 0.209 H/W = (P+C)/W+0.02 = 0.667 P/H = 0.657 C/H = 0.313 Vol./W^3 = 0.243
Addition # 10 - This is fun and easy to cut. Note: The P3 tier cuts through the girdle line. When you cut the C1 just leave enough so that the points are not fragile. This design has a very interesting and unique pattern. I like in about any saturation. Cut in refractive indexes 1.62 to 2.14 with no changes.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
Tourmaline Value, Price, and Jewelry Information
Mint Tourmalines: Gemstones for Our Times
Tourmaline Engagement Ring Stones: the Ultimate Guide
How Do Tourmalines Form?
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!