Faceting Design Diagram: Pearl – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Pearl (CHECK33.JRG) 5.12 carat pink Tourmaline
By Jeff R. Graham
Copyright 2001
88.3% Light Return
Angles for R.I. = 1.62
53 facets + 17 facets on girdle = 70
1-fold, mirror-image symmetry
96 index
L/W = 1.165 T/W = 0.199 T/L = 0.171
P/W = 0.435 C/W = 0.217
H/W = (P+C)/W+0.02 = 0.672
P/H = 0.647 C/H = 0.324
Vol./W^3 = 0.241

Addition # 6 – I designed this to go with pearls. I wanted something roundish, but not quite round. I originally had Tourmaline in mind, but this works well for stones in refractive indexes 1.73 to 1.93 with no changes.


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.