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


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

Brilliant Square (MIR37.JRG)
By Jeff R. Graham
Copyright 2004
91.6% Light Return
Angles for R.I. = 1.62
57 facets + 8 facets on girdle = 65
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.325 T/L = 0.325
P/W = 0.466 C/W = 0.189
H/W = (P+C)/W+0.02 = 0.675
P/H = 0.691 C/H = 0.279
Vol./W^3 = 0.272

Addition # 9 – Cut in refractive indexes 1.62 to 2.14 with no changes. This is fast and not hard to cut. Note: The C4 tier cuts to the corners at 96-24- 48-72, the facets do not point, just cut them evenly. This is great in about any material and I like it in all colors.


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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