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35 Most Valuable Gemstones, From Least to Most Expensive
A number of the most valuable gemstones are new discoveries that have ... This is an example of a raw, natural amblygonite stone found in Minas Gerais, Brazil. Measuring over 3 inches across ...
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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 ...