If you were born within the month of December, then your birthstone is one of the newest jewels today. This “gemstone of the 20th century” was just discovered in 1967. It's not just the newest gem, but one of the most outstanding. The tanzanite has a rich bluish-purple hue that looks brilliant in any light. Our selection of December tanzanite rings is large and contains one just for you. Track it down and make a great purchase.