Thor’s 1.225: Faceting Design Diagram
Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Thor's 1.225".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Thor's 1.225 (CHECK80.JRG)
By Jeff R. Graham
Copyright 2003
88.6% Light Return
Angles for R.I. = 1.62
45 facets + 17 facets on girdle = 62
1-fold, mirror-image symmetry
96 index
L/W = 1.225 T/W = 0.275 T/L = 0.224
P/W = 0.428 C/W = 0.192
H/W = (P+C)/W+0.02 = 0.640
P/H = 0.669 C/H = 0.300
Vol./W^3 = 0.228
Addition # 8 - This takes a lot of cutting but is worth the trouble and is very nice in about any material. Cut this in refractive indexes 1.62 to 1.93 with no changes. Be sure the pavilion point is centered over the dop when cutting the pavilion.
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
Tourmaline Buying Guide
Green Tourmaline (Verdelite) Buying Guide
A Beginner’s Guide To Common Gemstone Heat Treatments
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!