Sunstone (Feldspar, Bytonite, Labradorite, Spectrolite, Orthoclase)
Vanguard (SUN38.JRG)
By Jeff R. Graham
Copyright 2006
83.2% Light Return
Angles for R.I. = 1.54
16 facets + 4 facets on girdle = 20
4-fold symmetry
96 index
L/W = 1.000 P/W = 0.450 C/W = 0.165
H/W = (P+C)/W+0.02 = 0.635 P/H = 0.709 C/H = 0.259 Vol./W^3 = 0.258
PAVILION
CROWN
Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is easy, fast to cut, and designed for earrings and thin rough. It will work in color or light shiller. Large sized stones work best and I would suggest 8mm and up.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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