This stone changes its colors like a chamaeleon: Green-grey in daylight and purple in artificial light. A stone of real understatement, discovered in the Urals on the birthday of the Tsar AlexanderII.
Formula: BeAl2O4
Hardness: 8.5
Density: 3.71 – 3.76 g/cm3
Refractive Index: 1.739 – 1.770 DR: 0.007 – 0.011
Color:
Color change from green or blue-green (daylight) to red or violet-red (incandescent light)
Countries of Origin:
Russia, Brazil, Sri Lanka, India, Tanzania, Madagascar