Faceting Design Diagram: Uneven Swirl – Garnet – Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite


Garnet (Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite)

Uneven Swirl (GNETP14.JRG) Chrysoberyl cut by Tony Carson
By Jeff R. Graham
Copyright 1993
80.4% Light Return
Angles for R.I. = 1.73
43 facets + 6 facets on girdle = 49
6-fold symmetry
96 index
L/W = 1.155 T/W = 0.516 T/L = 0.447
P/W = 0.416 C/W = 0.193
H/W = (P+C)/W+0.02 = 0.629
P/H = 0.662 C/H = 0.306
Vol./W^3 = 0.254

Addition # 3 – This design is a little unusual to cut because the P3, P4, facets are not all meet point. Cut them a evenly as you can, they do cut to center point. This design works well in medium to light material, 1-8cts. Cut in refractive indexes 1.73 to 2.14 (81.5%)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.