Description

100% Natural - Not treated in any way.
Rare Colectors Gem.
Suitable for Museums,Institutions and Students of Gemology.
Beautiful sharp Star effect.
Among the Rarest of gemstones.

Refractive Index: 1.741 - 1.760
Hardness: 8.5
Chemical Comp: BeAl2O4
Density: 3.73
Crystal Group: Orthorhombic

Rarely some gems display a 4 Rayed Star which are extremely rare – a collector’s gem. Fine inclusions in the stone are responsible for this phenomenon called chatoyancy. The incident light is reflected in such a way that a bright strip of light appears running perpendicular to the inclusions.