When you think of expensive gemstones, what comes to mind? Most people think of the Big Four: diamonds, emeralds, rubies and sapphires. However, it might surprise you to know that there are ...

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 ...

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.

Fri, January 17, 2025 at 9:00 PM UTC ...

Lau, a property developer with a fortune estimated by Forbes at $9.9 billion, has a habit of snapping up expensive gems for his children. At a Sotheby's Geneva auction in 2009, he bought another ...