Faceting Design Diagram: Button Up – Feldspar – Bytonite, Labradorite, Spectrolite, Orthoclase

Sunstone (Feldspar, Bytonite, Labradorite, Spectrolite, Orthoclase)

Button Up (SUN37.JRG)
By Jeff R. Graham
Copyright 2006
88.7% Light Return
Angles for R.I. = 1.54
37 facets + 8 facets on girdle = 45
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.211 T/L = 0.211 P/W = 0.450
C/W = 0.245 H/W = (P+C)/W+0.02 = 0.715 P/H = 0.629 C/H = 0.343 Vol./W^3 = 0.290

Addition # 11 – Cut in refractive indexes 1.54 to 2.14 with no changes. This is fairly easy to cut and designed for light colored rough and watermelons. Be sure and center the color over the point of the pavilion. The color will mix, so check that the colors mix well before cutting.