First discovered by Portuguese prospector Manuel d’Souza, Tanzanite was introduced by the famous Tiffany & Co jewelry in 1969. Due to the allure of its bluish purple coloring, Tanzanite was the number one colored stone sold worldwide in 1998 and 1999. The finest specimens of Tanzanite are violet colored, and have a slightly less intense shade than their peers. Tanzanite is the recommended gift for the 24th wedding anniversary.