Kornerupine

Color: green, yellow-green, brown, blue-green Hardness: 7 Refractive index: 1.66 - 1.69 Density: 3.25 - 3.35 Chemical composition: (Mg,Fe)4(Al,Fe)6(SiO4,BO4)5(O,OH)2 Crystal structure: orthorhombic Origins: Greenland, Tanzania, Madagascar, Kenya, Sri Lanka, Burma, Australia. Collector's stone. Crystals demonstrate noticeable pleochroism effect, from yellowish green to reddish brown. Clean specimens over 5 ct. are rare. Stones are generally not treated.

Market values of Kornerupine  

Historical values