Faceting Design Diagram: Gentleman’s Choice – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Gentleman’s Choice (CHECK66.JRG)Nigerian Tourmaline
By Jeff R. Graham
Copyright 2003
89.6% Light Return
Angles for R.I. = 1.62
33 facets + 8 facets on girdle = 41
2-fold, mirror-image symmetry
96 index
L/W = 1.128 T/W = 0.456 T/L = 0.404
P/W = 0.495 C/W = 0.157
| H/W = (P+C)/W+0.02 = 0.671
P/H = 0.737 C/H = 0.233
Vol./W^3 = 0.327

Addition # 8 – Cut this in refractive indexes 1.62 to 2.14 with no changes. I designed this for a man’s ring, the shape is like the old style Masonic rings. I like this in about any material. It cuts easily and quickly.

 


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler