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


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

Twinkle (MIR40.JRG)
By Jeff R. Graham
Copyright 2004
86% Light Return
Angles for R.I. = 1.62
40 facets + 6 facets on girdle = 46
3-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.385 T/L = 0.334
P/W = 0.397 C/W = 0.212
H/W = (P+C)/W+0.02 = 0.630
P/H = 0.631 C/H = 0.337
Vol./W^3 = 0.239

Addition # 9 – This is not hard to cut, but the meets can be a little tough from a technical standpoint. This works well in any material. Cut in refractive indexes 1.62 to 1.76 with no changes. This is nice in Garnet.


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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