the opal is a coveted gemstone, as its eye-catching colors have captivated people for thousands of years. Depending on who you ask, opals are either considered lucky or unlucky (thanks to Walter ...

Global demand for opals is soaring, pushing up prices of the gemstones. As the 40ft (12m) drill rattles down through the red dirt, miner Craig Stutley makes a statement that sounds a lot like what ...

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. After investing tens of thousands of ...