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.
Opal is a precious resource in Coober Pedy and the international market for opals is what helps keep the outback South Australian town going. Miners rely on buyers coming from Hong Kong and India to ...
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