Following is a transcript of the video. 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.
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Yellowstone calls for ‘citizen scientists’ to help research Biscuit Basin explosionAnyone who has additional photos or videos of Black Diamond Pool, Black Opal Pool, or Wall Pool taken between July 16 and ...
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