Amethyst: comes from the Greek word A, meaning "not" and Methuskein, meaning "to intoxicate"; a reference to the ancient belief that the stone protected its owner from drunkenness. It is the most highly valued and recognizable gemstone of the macrocrystalline Quartz family. It is prized as a semiprecious gem for its violet color. It contains more iron oxide (Fe2O3) than any other variety of Quartz, and experts believe that the color is the result of its iron content. It is said that Amethyst magnifies psychic abilities and right-brain activity. It is credited for strengthening the immune system, while energizing and purifying the blood. Some believe it to also be beneficial in relieving headaches and improving blood sugar imbalance. Amethyst is the modern birthstone for the month of February and people born under the zodiac sign of Aquarius (Water Bearer). It is also the anniversary gemstone representing the 4th and 6th year of marriage.