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 ...
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People Born in October Have a Birthstone That Sparks Creativity—Here's What It IsWhen it comes to October birthstones, there's one primary stone and one alternative ... from rare sources that make some opals extremely expensive. “High-quality opals that display a vibrant ...
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 ...
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