Crystal Tourmaline: Faceting Design Diagram
Tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Crystal Tourmaline".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Crystal Tourmaline (TLINE8.JRG)
By Jeff R. Graham
Copyright 1994
81.0% Light Return
Angles for R.I. = 1.62
43 facets + 9 facets on girdle = 52
3-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.467 T/L = 0.435
P/W = 0.441 C/W = 0.177
H/W = (P+C)/W+0.02 = 0.638
P/H = 0.692 C/H = 0.277
Vol./W^3 = 0.241
Gram Book 1 - This design is a nice one. It works great for material that has this shape on the "C" axis. It should be cut in a little larger size, and any color that has good light through the "C", 1-6cts. This works very well cut in the Nigerian pink Tourmaline. Cut in refractive index 1.62 to 1.93 (83.6%) with no changes.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
