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.

Opalised mussels found near Lightning Ridge.(Supplied: Bob Smith) Common opal can be found all over the world, but the precious, coloured opal of Lightning Ridge is exceedingly rare.

and the Western U.S. — it can also be found in laboratories around the world. Let's talk similarities and differences and pros and cons of synthetic versus natural opals. What's the difference ...

With the largest, best-quality Australian opals worth more than £600,000 thanks to soaring demand from jewellers around the world, there is a vast amount of money to be - potentially - made.

The shinier the pearl, the better. Black opal is one of the rarest gemstones in the world, sought after for its seemingly infinite display of colors, compared to common opal, which is usually one ...

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.