Faceting Design Diagram: Arabian Star – Garnet – Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite


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

Arabian Star (MC66.JRG) Mombo Garnet
By Jeff R. Graham
Copyright 2002
90% Light Return
Angles for R.I. = 1.62
37 facets + 8 facets on girdle = 45
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.405 T/L = 0.405
P/W = 0.447 C/W = 0.186
H/W = (P+C)/W+0.02 = 0.653
P/H = 0.684 C/H = 0.285
Vol./W^3 = 0.253

Addition # 7 – If you like my “Tic Tac” design then you will love this one. The crown on this design is very striking in a large sized stone where it can be easily seen. Cut in refractive indexes 1.62 to 1.93 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.