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
Garnet Value, Price, and Jewelry Information
How Do Garnets Form?
Top Spots for Gem Hunting in the US
Eight Famous Sapphires and the Stories Behind Them
How to Dry Opals Safely
Rose Quartz Value, Price, and Jewelry Information
Ten Big, Beautiful, and Affordable Engagement Ring Stones
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!