Faceting Design Diagram: A Star Sq. – Apatite – Yellow, Green, Neon, Blue


Apatite (Yellow, Green, Neon, Blue)

A Star Sq. (APAT3.JRG)
By Jeff R. Graham
Copyright 1998
81% Light Return
Angles for R.I. = 1.64
61 facets + 8 facets on girdle = 69
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.498 T/L = 0.498
P/W = 0.417 C/W = 0.176
H/W = (P+C)/W+0.02 = 0.614
P/H = 0.680 C/H = 0.288
Vol./W^3 = 0.221

Addition # 2 – This cuts easy, the C4 might have to be floated in, roughing in the table helps. Cut in about any good material, 1-12cts. This works well in Peridot as well as Topaz and Tourmaline. Cut in refractive indexes 1.62 to 2.14 (84.6%) with no changes.


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.