Umba sapphire
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The Umba sapphire is a unique type of fancy sapphire discovered circa 1960 in the Gerevi Hills, north of the Umba River in the Umba Valley of Tanzania. Umba sapphires exhibit coloration not common to sapphires sourced from other parts of the world.
As of November 2006, the Tanzanian government prohibits export of these sapphires.
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