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 ...

including the rarest gemstones. Here’s a look at some of the most expensive rings in the world, their unique features, and the stories behind them. 1. The Pink Star Diamond Ring – $71.2 ...