Diamonds & Bonz’s: Faceting Design Diagram

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

Diamonds & Bonz's (CHECK52.JRG)
By Jeff R. Graham
Copyright 2002
90.5% Light Return
Angles for R.I. = 1.62
41 facets + 8 facets on girdle = 49
2-fold, mirror-image symmetry
96 index
L/W = 1.023 T/W = 0.301 T/L = 0.295
P/W = 0.470 C/W = 0.202
H/W = (P+C)/W+0.02 = 0.692
P/H = 0.679 C/H = 0.292
Vol./W^3 = 0.304

Addition # 8 - Cut this in refractive indexes 1.62 to 1.93 with no changes. This is a little complicated, but not too hard to cut. The crown facets cut fast, especially on a small stone. This works well in about any material.

Random - Cosine - ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler