Faceting Design Diagram: Universal Oval – Apatite – Yellow, Green, Neon, Blue


Apatite (Yellow, Green, Neon, Blue)

Universal Oval (APAT2.JRG)
By Jeff R. Graham
Copyright 1998
86% Light Return
Angles for R.I. = 1.64
71 facets + 16 facets on girdle = 87
2-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.748 T/L = 0.563
P/W = 0.435 C/W = 0.177
H/W = (P+C)/W+0.02 = 0.632
P /H = 0.688 C/H = 0.280
Vol./W^3 = 0.302

Addition # 3 – This also works in Peridot, Spinel, Garnet, & Sapphire. It cuts well and is pretty standard. It has nice light return for an oval and works in most material. Cut in light to medium material, 1-24cts.

 

 


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.