Rapids: 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 "Rapids".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
By Jeff R. Graham
83.1% Light Return
Angles for R.I. = 1.62
97 facets + 12 facets on girdle = 109
12-fold, mirror-image symmetry
L/W = 1.000 T/W = 0.349 T/L = 0.349 P/W = 0.419 C/W = 0.315
H/W = (P+C)/W+0.02 = 0.754 P/H = 0.556 C/H = 0.418
Vol./W^3 = 0.267
Addition # 13 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is designed for pale to lightly saturated material and is ideal for nodules. It is not hard to cut, but there are quite a few facets so it will take some time.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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