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December birthdays have the delight of three gemstones: Zircon, Tanzanite and Turquoise. Each of these gemstones carries a unique blue tone making it a perfect birthstone for frigid December winters. Zircon can be found in a variety of colors, but blue is the overwhelming favorite. Tanzanite: Discovered in the late 1960s in Tanzania, and found exclusively in this tiny area of the world, the Tanzanite gemstone exhibits a rich violet-blue color for which the gemstone is treasur