Faceting Design Diagram: Shutter 7 – Tourmaline, Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Shutter 7 Jeff Graham Facet Design 1 Shutter 7 Jeff Graham Facet Design 2

Shutter 7 (DOME33.JRG)
By Jeff R. Graham
Copyright 2007
83.8% Light Return
Angles for R.I. = 1.62
57 facets + 7 facets on girdle = 64
7-fold symmetry
77 index
L/W = 1.026 T/W = 0.220 T/L = 0.215 P/W = 0.398 C/W = 0.385
H/W = (P+C)/W+0.02 = 0.802 P/H = 0.495 C/H = 0.480
Vol./W^3 = 0.277

Addition # 13 – Cut in refractive indexes 1.62 to 2.14 with no changes. This is seven sided and will need a custom mounting. The flash is very interesting and this works best in light saturated material.

Shutter 7 Jeff Graham Facet Design 3

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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