December traditionally has not one, not two, but three birthstones: tanzanite, zircon and turquoise. December birthstone jewelry is particularly striking with these radiant gemstones bound to keep winter blues at bay. All known for their beautiful blue color, these three December birthstones span history. Zircon is the oldest-known mineral on earth (a 4.4 billion-year-old zircon was found in Jack Hills, Australia), turquoise is one of the first stones mined to be used in jewelry, and tanzanite is one of the most recently discovered gemstones. Here, we've rounded up five gift-worthy pieces that boast bold shocks of turquoise—perfect for a special occasion or sweet gift for no reason. Keep scrolling for December birthstone jewelry ideas.