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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.
What are the properties of the birthstone for December â tanzanite, zircon, and turquoise? Tanzanite is a 6.5 on the Mohs Scale of Hardness and has an orthorhombic crystal structure. Tanzanite can radiate different colors from different angles giving an appearance of color-changing.