Seven Rattle: Faceting Design Diagram
Helpful tips, details and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Seven Rattle"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Seven Rattle (DOME32.JRG)
By Jeff R. Graham
87.8% Light Return
Angles for R.I. = 1.62
71 facets + 7 facets on girdle = 78
7-fold, mirror-image symmetry
L/W = 1.026 T/W = 0.410 T/L = 0.399 P/W = 0.398 C/W = 0.339
H/W = (P+C)/W+0.02 = 0.757 P/H = 0.525 C/H = 0.448
Vol./W^3 = 0.280
Addition # 13 - Cut this in refractive indexes 1.62 to 2.14 with no changes. This is unusual and because it is seven-sided, it will need a custom setting. It has a lot of flash and looks very unusual when cut.
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?
Eight Famous Sapphires and the Stories Behind Them
How to Dry Opals Safely
Rose Quartz Value, Price, and Jewelry Information
Ten Big, Beautiful, and Affordable Engagement Ring 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!