Nimble: Faceting Design Diagram

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

Nimble (DOME9.JRG)
By Jeff R. Graham
Copyright 2007
84% Light Return
Angles for R.I. = 1.62
73 facets + 8 facets on girdle = 81
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.159 T/L = 0.159 P/W = 0.397
C/W = 0.315 H/W = (P+C)/W+0.02 = 0.733 P/H = 0.542 C/H = 0.431 Vol./W^3 = 0.255

PAVILION

CROWN

Addition # 13 - This is pretty fast to cut and deep to help darken light material. This works in R.I. 1.62to 1.76 with no changes. I designed this for pastel Afghan nodules and it yields well for the shape.

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

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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