Faceting Design Diagram: Thor’s 1.225 – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Thor’s 1.225 (CHECK80.JRG)
By Jeff R. Graham
Copyright 2003
88.6% Light Return
Angles for R.I. = 1.62
45 facets + 17 facets on girdle = 62
1-fold, mirror-image symmetry
96 index
L/W = 1.225 T/W = 0.275 T/L = 0.224
P/W = 0.428 C/W = 0.192
H/W = (P+C)/W+0.02 = 0.640
P/H = 0.669 C/H = 0.300
Vol./W^3 = 0.228

Addition # 8 – This takes a lot of cutting but is worth the trouble and is very nice in about any material. Cut this in refractive indexes 1.62 to 1.93 with no changes. Be sure the pavilion point is centered over the dop when cutting the pavilion.


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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