Sinkankas, John, Gemstones of North, Vol.III, 1997, Colored Plate #10.

Newman GG, MA, Renee, Gemstone Buying Guide, 1997, Colored Plates, pgs. 24,25,29,57,91.

David Federman, Modern Jeweler's GEM PG.ROFILE/2, 1992, Colored Plate, pg. 100.