Faceting Design Diagram: “U” Rect – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

“U” Rect (TLINE48.JRG)
By Jeff R. Graham
Copyright 1998
82.3% Light Return
Angles for R.I. = 1.62
47 facets + 6 facets on girdle = 53
2-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.758 T/L = 0.570
P/W = 0.451 C/W = 0.166
H/W = (P+C)/W+0.02 = 0.636
P/H = 0.708 C/H = 0.260
Vol./W^3 = 0.310

Addition # 3 – The 39 degree tier on the Pavilion are below the critical angle for 1.54, but because of the L/W on this cut it works in Quartzs also. This is a good cut for about any material and is not very hard, 1-12cts.


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.