Diamond Eye 2.0: Faceting Design Diagram

Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Diamond Eye 2.0 (CHECK83.JRG)
By Jeff R. Graham
Copyright 2003
75.3% Light Return
Angles for R.I. = 1.62
39 facets + 12 facets on girdle = 51
2-fold, mirror-image symmetry
96 index
L/W = 2.033 T/W = 0.458 T/L = 0.225
P/W = 0.415 C/W = 0.197
H/W = (P+C)/W+0.02 = 0.632
P/H = 0.657 C/H = 0.311
Vol./W^3 = 0.336

Addition # 8 - The light return on this is pretty good for a marquise. This works well in about any material, particularly medium saturated colored stones.

Random - Cosine - ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler