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World's rarest gemstone: What it looks like and its cost
The rarest gemstone in the world is considered to be ... The rarest mineral in the world is kyawthuite (Photo: mindat) Cost of kyawthuite The cost of the new rarest mineral in the world remains ...
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Why black opal is one of the most expensive gemstones in the world
Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. But mining black opal isn't easy. After investing tens of thousands of ...