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


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

Push (MC51.JRG)
By Jeff R. Graham
Copyright 2001
86.2% Light Return
Angles for R.I. = 1.62
39 facets + 12 facets on girdle = 51
1-fold, mirror-image symmetry
96 index
L/W = 1.216 T/W = 0.667 T/L = 0.549
P/W = 0.480 C/W = 0.153
H/W = (P+C)/W+0.02 = 0.653
P/H = 0.735 C/H = 0.234
Vol./W^3 = 0.255

Addition # 7 – This is a little tough to cut the first time and not for a beginner. Once you do it, this design is easy. Rough P16 in to the correct L/W=1.216 before cutting the P12. It might take some tweaking on the P12-P14, this is made to float. Cut in refractive indexes 1.62 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.