Faceting Design Diagram: 12 Board – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


Quartz (Amethyst, Citrine, Ametrine, Smokey, Rose)

12 Board (CHECK9.JRG)5.08 carat Amethyst
By Jeff R. Graham
Copyright 2001
89.1% Light Return
Angles for R.I. = 1.54
30 facets + 8 facets on girdle = 38
2-fold, mirror-image symmetry
96 index
L/W = 1.250 P/W = 0.450 C/W = 0.243
H/W = (P+C)/W+0.02 = 0.713
P/H = 0.631 C/H = 0.341 Vol./W^3 = 0.435

Addition # 6 – This is fast and bright, notice that there is no table. Cut the C4,C5 as evenly as you can, there is no real meet point on them. I like this in about any material.


Random – Cosine – ISO

 

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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