Tantra: 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 "Tantra".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Tantra (DOME3.JRG)
By Jeff R. Graham
Copyright 2007
82.8% Light Return
Angles for R.I. = 1.62
61 facets + 12 facets on girdle = 73
6-fold, mirror-image symmetry
96 index
L/W = 1.036 T/W = 0.258 T/L = 0.249 P/W = 0.397
C/W = 0.360 H/W = (P+C)/W+0.02 = 0.777 P/H = 0.511 C/H = 0.463 Vol./W^3 = 0.276
PAVILION
CROWN
Addition # 13 - Got a pale Tourmaline nodule? This design is ideal for light roundish rough. Cut in refractive indexes 1.62 to 1.93 with no changes. It is a good idea to cut a large stone so that the crown shows.
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
Tourmaline Value, Price, and Jewelry Information
How Do Tourmalines Form?
Tourmaline Buying Guide
What is Gemstone Pleochroism?
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!