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.

Serve the drink immediately to enjoy it at its best. The Black Opal is best served cold, with the icy mix adding to the ...

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(Supplied: Liz Smith) In the meantime, Bob was experimenting with macrophotography, capturing the opals and fossils that miners brought to them. "Black opal is the most amazing gemstone on the ...