Gemstones Tools

Alexandrite

Alexandrite cabochons
(al-eg'-zan-dryt')

1880; ger. alexandrit, from Alexander II Russian emperor

Variety of chrysoberyl used as a gemstone with a distinct green to red color change from daylight to incandescent light
Color
Distinct color change from red to green
Family
Chrysoberyl
Chemical composition
BeAL2O4
Crystal system
Orthorhombic
Hardness (Mohs scale)
8,5
Specific gravity
3,73 ±0,03
Refractive index
1,746-1,755 ±0,05
Birefringence
0,009
Optical character
Biaxial +
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