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.

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CICERO, Ind. (Hamilton County Reporter) — Dean Caldwell of Cicero has been mining opal and obsidian for six months of the year in Mexico for the last 15 years. Last year, he pulled an opal out of the ...

The Montepuez ruby mine in the north-east of Mozambique boasts the largest ruby asset globally and is currently valued at around $1bn. It produces some of the oldest rubies in the world, originally ...

When he’s not putting his Microsoft expertise to use, Adelaide-based MVP Daniel Brown has another passionate project – opal mining. With his launch of a new tool OpalAI, he has managed to combine his ...

Western North Carolina offers several locations for gem mining and exploration. Emerald Village, near Spruce Pine, allows visitors to dig for gems and go underground. Other popular spots in and around ...

(CNN)-- A hunt for precious gemstones revealed the first fossil evidence of a dinosaur herd, including a previously undiscovered dinosaur species, in Australia. The new dinosaur fossil was found in an ...

Add Yahoo as a preferred source to see more of our stories on Google. Lightning Ridge is a small mining town outside of New South Wales, Australia renowned for its black opal, which can sell for over ...