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

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

Hielo (MIR36.JRG)
By Jeff R. Graham
Copyright 2004
86.9% Light Return
Angles for R.I. = 1.62
27 facets + 6 facets on girdle = 33
3-fold symmetry
72 index
L/W = 1.048 P/W = 0.388 C/W = 0.193
H/W = (P+C)/W+0.02 = 0.601
P/H = 0.646 C/H = 0.321
Vol./W^3 = 0.178

Addition # 9 – This is interesting to cut and has a unique reflection. Cut in refractive indexes 1.62 to 2.14 with no changes. This is a neat earring design and works well in most material. Try it in Ametrine for an unusual stone.

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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