Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Floating Lilly (MIR52.JRG)
By Jeff R. Graham
Copyright 2005
88.6% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.204 T/L = 0.204 P/W = 0.434 C/W = 0.233 H/W = (P+C)/W+0.02 = 0.687 P/H = 0.632 C/H = 0.339
Vol./W^3 = 0.273
Addition # 10 – This is nice and the crown will appear to float. Note: The C2 depth can vary a bit, but I tend to like it like the diagram. You can see the “float” but it is not too deep. This is ideal in light to medium colors. The table can be left off on small stones. Cut in refractive indexes 1.62 to 2.14 with no changes.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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.
