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.

Black opal is one of the rarest gemstones in ... but now many sell for up to $10,000 per carat. And the price of larger stones has risen by as much as 25 times. In 2000, jewelry company Le Vian ...

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