Faceting Design Diagram: Styled “X” – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Styled “X” (TLINE31.JRG)
By Jeff R. Graham
Copyright 1995
75% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
2-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.869 T/L = 0.653
P/W = 0.479 C/W = 0.220
H/W = (P+C)/W+0.02 = 0.719
P/H = 0.666 C/H = 0.306
Vol./W^3 = 0.442

Addition # 2 – Roughing in the table before cutting the C7 facets helps when cutting. The girdle and P1-P8 can be cut in another order(Preform) if you want. The reflection is higher than it ray traced, light to med material, 1- 12cts. Cut in refractive indexes 1.62 to 1.76 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.