Amethyst is the purple variety of the mineral species quartz. Universally associated with the rich and royal color purple, its color can range from a cool/bluish tint to reddish “raspberry” purple. Being so associated in color to the royal color of purple, dignitaries and royalties have often used this stone as representations of their power and status. Up until the 18th century, this stone was included in the cardinal (most valuable) gemstones along with rubies, emeralds, and sapphires. One great example of a famous amethyst is a necklace created by Cartier Paris for the Duchess of Windsor in 1941 that sold for $373,996 at Sotheby’s Auction. Amethysts are thought to prevent evil thoughts, increase intelligence and cause shrewdness in man or woman engaging in business matters. If you need that extra luck entering into a new business transaction, this is the stone for you.