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 the ... And the price of larger stones has risen by as much as 25 times. In 2000, jewelry company Le Vian capitalized on the underappreciated naturally ...
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"Black opal is the most amazing gemstone on the planet," he says. "The images that come out of it, especially at magnification, are just totally unexpected." Sometimes this was the only chance to ...
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