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


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

Jeff Graham Facet Design

 Jeff Graham Facet Design

Octagon Lace (MIR59.JRG)
By Jeff R. Graham
Copyright 2005
91% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.246 T/L = 0.246 P/W = 0.438
C/W = 0.209 H/W = (P+C)/W+0.02 = 0.667 P/H = 0.657 C/H = 0.313 Vol./W^3 = 0.243

Addition # 10 – This is fun and easy to cut. Note: The P3 tier cuts through the girdle line. When you cut the C1 just leave enough so that the points are not fragile. This design has a very interesting and unique pattern. I like in about any saturation. Cut in refractive indexes 1.62 to 2.14 with no changes.

 Jeff Graham Facet Design

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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