Faceting Design Diagram: Scholar – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite

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

Scholar (CHECK24.JRG)
By Jeff R. Graham
Copyright 2001
89.7% Light Return
Angles for R.I. = 1.62
45 facets + 10 facets on girdle = 55
2-fold, mirror-image symmetry
96 index
L/W = 1.250 T/W = 0.402 T/L = 0.322
P/W = 0.489 C/W = 0.255
H/W = (P+C)/W+0.02 = 0.763
P/H = 0.640 C/H = 0.333
Vol./W^3 = 0.344

Addition # 6 – The crown on this design is a little tougher than usual to cut. The C4, C5, C6, stripes cut in until they look right, no meets on the C6. The best thing to do is rough them in and get the right proportions. This cuts in refractive indexes 1.62 to 1.93 with no changes. This works well in dark material.

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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