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


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

 

Thistle (MIR5.JRG) Thistle cut in blue/pink bi color Tourmaline
By Jeff R. Graham
Copyright 2004
90.4% Light Return
Angles for R.I. = 1.62
32 facets + 8 facets on girdle = 40
4-fold, mirror-image symmetry
96 index
L/W = 1.000 P/W = 0.466 C/W = 0.209
H/W = (P+C)/W+0.02 = 0.695
P/H = 0.671 C/H = 0.300
Vol./W^3 = 0.251

Addition # 9 – Note: The P3 cuts just short of center, by varying this tier you will notice that the scissor reflections on the crown will change. This is easy, very fast to cut and works well in any material. I especially like it in Garnets. Cut in refractive indexes 1.62 to 1.93 with no changes.

 


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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