December is an interesting month for birthstones because there is a triad to choose from. At one time or another, zircon, tanzanite and turquoise have all been appointed the birthstone of December. Most recently, the beautiful gemstone zircon has been a popular choice and with its amazing history and many varieties we can see why! Not found anywhere in the United States, zircon is mined in a dozen countries throughout the world including Australia, Sri Lanka, Cambodia, Mozambique and Thailand, to name a few1. If you had your heart set on finding a December birthstone that originated closer to home, Arizona is a main source of turquoise - a lovely alternate birthstone for this month.