Faceting Design Diagram: Quaker’s Light – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Quaker’s Light (CHECK43.JRG)
By Jeff R. Graham
Copyright 2003
82.2% Light Return
Angles for R.I. = 1.62
45 facets + 8 facets on girdle = 53
2-fold, mirror-image symmetry
96 index
L/W = 1.331 T/W = 0.378
T/L = 0.284 P/W = 0.453
C/W = 0.190 H/W = (P+C)/W+0.02 = 0.662
P/H = 0.683 C/H = 0.287
Vol./W^3 = 0.257

Addition # 8 – This cuts fairly easily and the L/W can vary slightly with no problems. Cut in refractive indexes 1.62 to 1.93 with no changes. This is good in about any material, but I prefer medium to light saturation.


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.