This blue-hued mineral is only mined in one part of the world, and it wasn't discovered until the 20th century.

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All Tanzanite Comes From a Single African Country — Plus More About Minerals
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    Tanzanite Is Africa's Real Blue Diamond

    Tanzanite Is Africa's Real Blue Diamond

    If rarity boosts a gemstone's value, tanzanite, which is mined from just one source, could be prized for that fact alone. Miners extract all the …

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