12 Glitter: Faceting Design Diagram
Details and information on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts and facets suitable for different gems.
12 Glitter (MC92.JRG)
By Jeff R. Graham
Copyright 2006
80.6% Light Return
Angles for R.I. = 1.67
121 facets + 12 facets on girdle = 133
12-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.382 T/L = 0.382 P/W = 0.465
C/W = 0.243 H/W = (P+C)/W+0.02 = 0.728 P/H = 0.639 C/H = 0.334 Vol./W^3 = 0.281
PAVILION
CROWN
Addition # 12 - Cut in refractive indexes 1.67 to 2.14 with no changes. This is fun to cut and is 12 sided which is a little unusual. It works well in any light to medium saturated material. Note: The girdle can be cut first then meet P1 to it to save rough.
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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