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)
Rapids (DOME40.JRG)
By Jeff R. Graham
Copyright 2007
83.1% Light Return
Angles for R.I. = 1.62
97 facets + 12 facets on girdle = 109
12-fold, mirror-image symmetry
96 index
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
PAVILION
CROWN
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
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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