Double Dutch Deep: Faceting Design Diagram
Successful tips and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Double Dutch Deep".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Double Dutch Deep (DOME22.JRG)
By Jeff R. Graham
Copyright 2007
79.1% Light Return
Angles for R.I. = 1.62
109 facets + 12 facets on girdle = 121
12-fold symmetry
96 index L/W = 1.000 T/W = 0.341 T/L = 0.341 P/W = 0.419
C/W = 0.325 H/W = (P+C)/W+0.02 = 0.764 P/H = 0.549 C/H = 0.425 Vol./W^3 = 0.309
PAVILION
CROWN
Addition # 13 - Cut in refractive indexes 1.62 to 2.14 with no changes. Cut this in lightly saturated materials. It works great in light to pale Afghan Tourmaline which is what I designed it for.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
