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


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

Birdie (CHECK75.JRG)Birdie in Mali Garnet
By Jeff R. Graham
Copyright 2003
84.3% Light Return
Angles for R.I. = 1.73
41 facets + 14 facets on girdle = 55
2-fold, mirror-image symmetry
96 index
L/W = 1.250 T/W = 0.292 T/L = 0.234
P/W = 0.455 C/W = 0.215
H/W = (P+C)/W+0.02 = 0.690
P/H = 0.659 C/H = 0.312
Vol./W^3 = 0.294

Addition # 8 – I designed this for a Mali Garnet, but it works well in any Garnet.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler