ABOUT emerald

  • Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.

Color Green
Mohs scale hardness 7.5 - 8.0
Specific gravity 2.63 - 2.91
Refractive index 1.57 - 1.58