“Streeeech”: 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 "Streech"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
"Streeeech" (TLINE62.JRG)
By Jeff R. Graham
Copyright 1998
72% Light Return
Angles for R.I. = 1.62
31 facets + 4 facets on girdle = 35
2-fold, mirror-image symmetry
96 index
L/W = 4.000 T/W = 3.491 T/L = 0.873
P/W = 0.602 C/W = 0.229
H/W = (P+C)/W+0.02 = 0.851
P/H = 0.707 C/H = 0.269
Vol./W^3 = 1.972
Addition # 2 - This works best on open "c" axis Tourmaline. A preform is needed 4.0 L/W. The crown can be cut as low as 32 degrees (10 degrees off of all the crown tiers), 2-18cts.
Random - Cosine - ISO
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
Top Spots for Gem Hunting in the US
Emerald Cutting Advice For Green Tourmaline And Rubellite
Some Advice for Cutting Tourmaline Gemstones
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!