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Birthstones for the calendar month of December are turquoise, blue topaz, tanzanite, zircon, lapis, onyx, ruby, and chrysoprase. The Zodiac signs of Sagittarius and Capricorn include five additional stones: agate, garnet, amethyst, sapphire, and beryl. Turquoise. Modern Birthstone.
The alternate birthstone for December is the zircon. Zircon, in its unchanged natural form appears colorless to pale yellow, or green. These colors are caused by minute quantities of thorium and uranium that replaces zircon in the crystal structure. But over the vast spans of geologic time, other forces work within the zirconium silicate crystals.