Universal Oval 2: Faceting Design Diagram
Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Universal Oval 2"
Apatite (Yellow, Green, Neon, Blue)
Universal Oval 2 (APAT1.JRG)
By Jeff R. Graham
79% Light Return
Angles for R.I. = 1.64
57 facets + 16 facets on girdle = 73
2-fold, mirror-image symmetry
L/W = 1.249 T/W = 0.657 T/L = 0.526
P/W = 0.483 C/W = 0.174
H/W = (P+C)/W+0.02 = 0.677
P/H = 0.713 C/H = 0.257
Vol./W^3 = 0.285
Addition # 2 - This works best in Peridot, Spinel, Garnet, and Sapphire. Cut a preform L/W to 1.25, then P1,P3,P5 are center point, the P7 is just short, hence the preform. This cut is pretty standard, 1-16cts. Cut in refractive indexes 1.64 to 2.14 (83.4%) with no changes.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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