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


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

Diamond Oval (GNETP40.JRG)
By Jeff R. Graham
Copyright 1997
90.3% Light Return
Angles for R.I. = 1.73
57 facets + 10 facets on girdle = 67
2-fold, mirror-image symmetry
96 index
L/W = 1.290 T/W = 0.557 T/L = 0.432
P/W = 0.406 C/W = 0.189
H/W = (P+C)/W+0.02 = 0.614
P/H = 0.660 C/H = 0.307
Vol./W^3 = 0.306

Addition # 2 – This cuts a little different. The P7 is a step that is cut into the finished shape. It can be cut in a different order, and is harder to cut than it might look. It works well in man-made Sapphire, Spinel, and YAG, 2-12cts.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler