Amethyst is the official birthstone for February as adopted by the American National Association of Jewelers in 1912. It is also the birth stone for the Zodiac sign of Pisces. See the birthstone table for additional references to this stone on alternative birthstone charts. Amethyst is suggested as a gem to give on the 4th, 6th and 17th wedding anniversaries.
Amethyst can occur as crystals that are six sided on either end. It also forms as drusy which are crystalline crusts covering the host rock. It is found inside geodes and in alluvial deposits all around the world and occurs in both crystalline or massive forms. When manganese is present in clear quartz amethyst is produced, while the amount of iron contained in the specimen accounts for the depth of purple.