1.40 Roval: 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.

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Garnet (Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite)

1.40 Roval (MC37.JRG)3.60 carat Zircon
By Jeff R. Graham
Copyright 1999
88.1% Light Return
Angles for R.I. = 1.62
49 facets + 10 facets on girdle = 59
2-fold, mirror-image symmetry
96 index
L/W = 1.414 T/W = 0.947 T/L = 0.670
P/W = 0.615 C/W = 0.160
H/W = (P+C)/W+0.02 = 0.795
P/H = 0.773 C/H = 0.202
Vol./W^3 = 0.478

Addition # 4 - I usually rough in the P4(G) after I cut the P2(G) to get an idea of where the P3's cut to. It can be done either way with no problem. This works well in about any material, 1cts+. Cut this in R.I. 1.62 to 1.76 without changes.

 

 


Random - Cosine - ISO

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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