Faceting Design Diagram: Striped “X” – Apatite – Yellow, Green, Neon, Blue


Apatite (Yellow, Green, Neon, Blue)

Striped “X” (APAT4.JRG)
By Jeff R. Graham
Copyright 1998
88% Light Return
Angles for R.I. = 1.64
85 facets + 12 facets on girdle = 97
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.591 T/L = 0.591
P/W = 0.439 C/W = 0.186
H/W = (P+C)/W+0.02 = 0.645
P/H = 0.680 C/H = 0.289
Vol./W^3 = 0.279

Addition # 2 – This works well in Peridot, Garnet, Sapphire, and Spinel. Cut it in a larger stone, I like peridot. The steps can change a little without much trouble, 1-24cts. Cut in refractive indexes 1.64 to 1.93 (88.7%) 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.