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


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

Almost (CHECK78.JRG)
By Jeff R. Graham
Copyright 2003
89.4% Light Return
Angles for R.I. = 1.62
49 facets + 12 facets on girdle = 61
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.350 T/L = 0.350
P/W = 0.383 C/W = 0.205
H/W = (P+C)/W+0.02 = 0.608
P/H = 0.631 C/H = 0.337
Vol./W^3 = 0.186

Addition # 8 – Cut this in refractive indexes 1.62 to 2.14 with no changes. This design is not quite round but it will fit in a round setting. It looks interesting when cut. This works well in about any material.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler