Amethyst. February birthstone.
Amethyst is a natural form of crystalline quartz and one of the most valuable semi-precious stones. A completely pure and perfect amethyst is transparent and colorless.
Typical amethysts have different violet ranges, some more reddish and others more bluish. It is said to cure drunkenness and make you quick-witted in business.
Amethyst has been popular and desired throughout history, in part because purple was the color reserved for royalty. Myths from the time of ancient Greece ensure that amethysts have healing and protective properties.
Amethyst is the gem traditionally given for the sixth wedding anniversary.