Faceting Design Diagram: Channel Pattern – Topaz – Swiss, Electric, London Blue, Imperial, White, Yellow, Pink, Purple, Champange

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

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.