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 ...

Fire opals are translucent and contain shades ... jewelry are fueling the rise in popularity of this unusual stone. The Most Expensive Black Diamond in the World It's difficult to ascertain ...

High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. Over 90% of black opals come from Australia, but they aren't easy to find.