Prop Square: Faceting Design Diagram

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

Prop Square (TOPAZ11.JRG)
By Jeff R. Graham
Copyright 1998
75.5% Light Return
Angles for R.I. = 1.62
53 facets + 4 facets on girdle = 57
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.589 T/L = 0.589
P/W = 0.550 C/W = 0.246
H/W = (P+C)/W+0.02 = 0.816
P/H = 0.674 C/H = 0.302
Vol./W^3 = 0.389

Addition # 2 - This is a nice cut, I like it in Tourmaline. The P6 facets are cut in until they look right, no meet. I like this pattern in a medium color material and around 2cts+. Cut in refractive indexes 1.62 to 1.93 (85.5%) with no changes.

Random - Cosine - ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler