Channel Pattern: Faceting Design Diagram

Topaz (Swiss, Electric, London Blue, Imperial, White, Yellow, Pink, Champange)

Channel Pattern (TOPAZ19.JRG)
By Jeff R. Graham
Copyright 1998
79% Light Return
Angles for R.I. = 1.62
101 facets + 8 facets on girdle = 109
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.497 T/L = 0.497
P/W = 0.440 C/W = 0.199
H/W = (P+C)/W+0.02 = 0.659
P/H = 0.668 C/H = 0.302
Vol./W^3 = 0.238

Addition # 3 - This can be a little tricky to cut, the steps take a lot of lining up. I would cut this in a larger size, it works well in about any material. Also this is a good cut for "c" axis Tourmaline, 1-18cts. 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