Darhla: Faceting Design Diagram
Detailed information and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Darhla".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Darhla (MIR76.JRG)
By Jeff R. Graham
Copyright 2005
91.4% Light Return
Angles for R.I. = 1.62
41 facets + 10 facets on girdle = 51
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.287 T/L = 0.273 P/W = 0.433 C/W = 0.238
H/W = (P+C)/W+0.02 = 0.691 P/H = 0.627 C/H = 0.344
Vol./W^3 = 0.217
PAVILION
CROWN
Addition # 10 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is very nice and works well in about any saturation. I tend to prefer light to medium saturated stones and I like it in Tourmaline. It is a great Topaz cut.
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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