Australia is a global hotspot for opal, with some regions producing rare and unique varieties like Boulder Opal, often called "Rainbow Tree" stones for their kaleidoscopic colors. This abundance ...

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.

Rain in the outback South Australian town of Andamooka usually comes with the promise of rare opals washing up ... having a look around after the rain for some opal, and this lady kind of ...

The two men are standing in the middle of the sun-bleached South Australian outback, hunting for opals, the rare gemstones that ... they did at least have some recent luck, when in March they ...