Deep “D”: Faceting Design Diagram
Detailed information and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Deep "D" ".
Topaz (Swiss, Electric, London Blue, Imperial, White, Yellow, Pink, Champange)
Deep "D" (TOPAZ10.JRG)
By Jeff R. Graham
Copyright 1998
81% Light Return
Angles for R.I. = 1.62
65 facets + 12 facets on girdle = 77
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.561 T/L = 0.561
P/W = 0.516 C/W = 0.241
H/W = (P+C)/W+0.02 = 0.778
P/H = 0.664 C/H = 0.310
Vol./W^3 = 0.369
Addition # 2 - A preform is a good idea. The P3(G) girdle facets should be about 50% in length of a P2(G) facet. These are floated in and have no real meets. It's a little tricky to cut, the depth improves color & dispersion, 1ct+. Cut in refractive indexes 1.62 to 1.93 with no changes.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
