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 ...

More from So Expensive Amethyst is one of the most abundant crystals in the world, but the most prized pieces can cost almost a million dollars. Some of the world's largest amethyst geodes come ...

However, that did not deter a luxury beachfront hotel in Spain that unveiled what has been dubbed the "world's most expensive Christmas ... among other gems. The tree also included Art Deco ...

including the rarest gemstones. Oghenerume Progress Follow 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 ...