Amethyst

Until the 19th century when major deposits were found in South America, Amethyst was as valuable as Emerald and Ruby. It was believed to prevent intoxication and means 'not drunk' in ancient Greek.

Amethyst is a popular natural gem for its beautiful purple hues. From a light mauve to a deep dark Purple. In Bolivia Amethyst and Citrine can occur together in the same crystal, this is known as Ametrine.

Amethyst is the birthstone for February and for the the 6th and 17th wedding anniversaries. 

Mineral: Quartz

Refractive index: 1.544 to 1.533

Specific Gravity: 2.66

MOHS hardness: 7