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35 Most Valuable Gemstones, From Least to Most Expensive
here are the 35 most valuable gemstones in the world, ranked by their price per carat weight. And, yes, this list does include diamonds, emeralds, rubies and sapphires. Price per carat:$51-$108.08 ...
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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 ...