Faceting Design Diagram: Roval Brilliant – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Roval Brilliant (MC39.JRG)
By Jeff R. Graham
Copyright 1999
89.9% Light Return
Angles for R.I. = 1.62
49 facets + 10 facets on girdle = 59
2-fold, mirror-image symmetry
96 index
L/W = 1.414 T/W = 0.749 T/L = 0.530
P/W = 0.615 C/W = 0.210
H/W = (P+C)/W+0.02 = 0.844
P/H = 0.728 C/H = 0.248
Vol./W^3 = 0.516

Addition # 4 – This is more of a brilliant top design, it works well with about any material. The yield is very high and it cuts easily. It works well with a trillion on either side, 1cts+. Cut this in R.I. 1.62 to 1.93 (90.5%) without changes.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler