Sheila: Faceting Design Diagram
Successful tips, details and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Sheila".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Sheila (MC113.JRG)
By Jeff R. Graham
Copyright 2002
79.2% Light Return
Angles for R.I. = 1.62
124 facets + 18 facets on girdle = 142
3-fold, mirror-image symmetry
96 index
L/W = 1.039 T/W = 0.459 T/L = 0.442 P/W = 0.506
C/W = 0.201 H/W = (P+C)/W+0.02 = 0.726 P/H = 0.696 C/H = 0.276 Vol./W^3 = 0.259
PAVILION
CROWN
Addition # 12 - Cut in refractive indexes 1.62 to 2.14 (83.3%) with no changes. This is really nice in medium colored material and needs to be cut in a large size. This cuts faster than it looks.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
