Tanzanite has been designated as the birthstone of life, and it became December's birthstone in 2002. Ranging in color from pale, violet gray to brilliant, deep blue, tanzanite is increasingly becoming the precious gemstone of choice in earrings, pendants, and rings. First discovered in 1967, naturally formed tanzanite is only found in the Mererani Hills near Mount Kilimanjaro, making it extremely rare. A mood stone of sorts, the gem takes on different colors that are then influenced further by different lighting. Depending on its shape and lighting conditions, the same tanzanite stone can appear deep sapphire blue, violet or burgundy. Tanzanite can be heat-treated to modify its color without affecting its beauty. Tanzanite is durable and will provide years of enjoyment with proper care. The stone is easily maintained by washing with warm, mild soap and water. Tiffany & Co. named this gem after its country of origin, and the gem continues to grow in popularity. Generally considered a loner, tanzanite is best displayed alone rather than in competition with other stones in the same piece of jewelry. There is a large and varied inventory of genuine tanzanite available on eBay, in all color ranges and styles from raw, uncut, rough specimens of tanzanite to tanzanite set in precious metals and settings.