Jot: Faceting Design Diagram

Sunstone (Feldspar, Bytonite, Labradorite, Spectrolite, Orthoclase)

Jot (SUN24.JRG)
By Jeff R. Graham
Copyright 2006
83.8% Light Return
Angles for R.I. = 1.54
46 facets + 9 facets on girdle = 55
3-fold, mirror-image symmetry
96 index
L/W = 1.065 T/W = 0.586 T/L = 0.550 P/W = 0.495
C/W = 0.193 H/W = (P+C)/W+0.02 = 0.709 P/H = 0.699 C/H = 0.273 Vol./W^3 = 0.273

PAVILION

CROWN

Addition # 11 - Cut in refractive indexes 1.54 to 2.14 with no changes. This is designed for light to medium colored rough and works well in Beryl. Note: The corners are variable and basically cut them in to match the diagram. This is not hard to cut, but be careful when cutting the crown to make the steps accurate.

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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