From Tanzanite to Benitoite, this article unveils the five rarest gemstones in the world that hold more than vibrant colors.

In its green form, however, it's beautiful enough to be considered a rare gemstone. These samples are rarely found outside of Kimberley, South Africa, but more common versions can be found in ...

Tanzanite is only found in northern Tanzania and is used to make ornaments. It is one of the rarest gemstones on Earth, and one local geologist estimates its supply may be entirely depleted within ...

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