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 ...

People have used gemstones for protection, to ward off evil, for supposed healing properties or simply to show off their wealth. The biggest, most expensive gemstones have always been popular ...

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 ...

While many expensive things have useful, revenue-generating purposes, some of the world’s most expensive objects ... This timepiece features 874 individual gemstones, including three heart ...

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.