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

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

Dome Brilliant Jeff Graham Facet Design 1 Dome Brilliant Jeff Graham Facet Design 2

Dome Brilliant (DOME41.JRG)
By Jeff R. Graham
Copyright 2007
81.6% Light Return
Angles for R.I. = 1.62
85 facets + 12 facets on girdle = 97
12-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.262 T/L = 0.262 P/W = 0.405 C/W = 0.419
H/W = (P+C)/W+0.02 = 0.843 P/H = 0.480 C/H = 0.496
Vol./W^3 = 0.310

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 and it will take some time.

Dome Brilliant Jeff Graham Facet Design 3

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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