Step’in “C”: Faceting Design Diagram
Successful tips, details and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Step'in C"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Step'in "C" (MIR77.JRG)
By Jeff R. Graham
Copyright 2005
88.8% Light Return
Angles for R.I. = 1.62
29 facets + 8 facets on girdle = 37
2-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.257 T/L = 0.257 P/W = 0.438
C/W = 0.229 H/W = (P+C)/W+0.02 = 0.687 P/H = 0.637 C/H = 0.334 Vol./W^3 = 0.320
PAVILION
CROWN
Addition # 10 - Cut in refractive indexes 1.62 to 1.76 with no changes. This is designed for dark axis "c" Tourmaline. It is easy to cut and works well. It has step/checker reflection. The crown can be lowered to 30 degrees for very dark material.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
