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.

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. German retailer Koroit Opal Company specializes in curating and selling Australian gemstones. Koroit is not just the company’s ...

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 ...

The Queensland government has confirmed it will allow opal mining to continue on land surrounded by a new national park. Vergemont Station was purchased by the state in April last year. Miners with ...

What is now desert was once under water, back when giant marine reptiles swam freely in a shallow sea that would later become Nevada’s Great Basin. Major geological activity happened, making way for ...