Faceting Design Diagram: Bi-Color Split 3.0 – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite

Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Bi-Color Split 3.0 (TLINE69.JRG)
By Jeff R. Graham
Copyright 1998
87% Light Return
Angles for R.I. = 1.62
33 facets + 8 facets on girdle = 41
2-fold, mirror-image symmetry
96 index
L/W = 3.000 T/W = 2.153 T/L = 0.717
P/W = 0.536 C/W = 0.242
H/W = (P+C)/W+0.02 = 0.798
P/H = 0.672 C/H = 0.303
Vol./W^3 = 1.280

Addition # 2 – Thanks to a friend of mine named Paul I got this idea from him (with his permission) and put my own spin on it. This design is for bi-colored Tourmaline, it flashes from the middle to the edge depending on how it’s rocked, 1-24cts. This makes a nice stone in any medium solid colored material, even though I designed it for bi-colored Tourmaline.

Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

About the author
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.
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