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.
Garnet (Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite)
1.40 Roval (MC37.JRG)
By Jeff R. Graham
88.1% Light Return
Angles for R.I. = 1.62
49 facets + 10 facets on girdle = 59
2-fold, mirror-image symmetry
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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