Green “O”: Faceting Design Diagram

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

Green "O" (TLINE3.JRG)
By Jeff R. Graham
Copyright 1995
79% Light Return
Angles for R.I. = 1.62
63 facets + 14 facets on girdle = 77
2-fold, mirror-image symmetry
96 index
L/W = 1.400 T/W = 0.829 T/L = 0.592
P/W = 0.449 C/W = 0.188
H/W = (P+C)/W+0.02 = 0.656
P/H = 0.683 C/H = 0.286
Vol./W^3 = 0.350

Addition # 1 - This design is med-hard to cut and gives very nice return on crystal shaped rough. Cut in light to medium material, 2-12cts. Good in Topaz.

Random - Cosine - ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler