Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Port of Call".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Port of Call (MC57.JRG)
By Jeff R. Graham
Copyright 2002
82.5% Light Return
Angles for R.I. = 1.62
73 facets + 18 facets on girdle = 91
3-fold, mirror-image symmetry
96 index
L/W = 1.048 T/W = 0.488 T/L = 0.465
P/W = 0.493 C/W = 0.211
H/W = (P+C)/W+0.02 = 0.725
P/H = 0.681 C/H = 0.292
Vol./W^3 = 0.246
Addition # 7 - This design is made to be deep for lighter colored materials and has great dispersion. Cut it refractive indexes 1.62 to 1.93 with no changes. I like this in white Zircon…
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Port of Call (MC57.JRG)
By Jeff R. Graham
Copyright 2002
82.5% Light Return
Angles for R.I. = 1.62
73 facets + 18 facets on girdle = 91
3-fold, mirror-image symmetry
96 index
L/W = 1.048 T/W = 0.488 T/L = 0.465
P/W = 0.493 C/W = 0.211
H/W = (P+C)/W+0.02 = 0.725
P/H = 0.681 C/H = 0.292
Vol./W^3 = 0.246
Addition # 7 - This design is made to be deep for lighter colored materials and has great dispersion. Cut it refractive indexes 1.62 to 1.93 with no changes. I like this in white Zircon…
Random - Cosine - ISO
