Faceting Design Diagram: Float Sq. Check – Reflector – Garnet – Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite

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

Float Sq. Check – Reflector (MC42.JRG)10.43 carat Amethyst
By Jeff R. Graham
Copyright 1999
91% Light Return
Angles for R.I. = 1.73
32 facets + 8 facets on girdle = 40
4-fold, mirror-image symmetry
96 index
L/W = 1.000 P/W = 0.466 C/W = 0.225
H/W = (P+C)/W+0.02 = 0.711
P/H = 0.656 C/H = 0.316
Vol./W^3 = 0.294

Addition # 4 – This is fun to cut, there are no meets on the top after C3. Cut them as square as you can. The corners float and you can vary the crown height using the C2 tier. I use this for darker material, it works good in grape Garnet, 1cts+. Also works in Spine, Sapphire, and man-made materials.



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.