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 ...

While, yes, emeralds tend to be the most popular green gemstone, they’re certainly not the only one and not even the most expensive by carat weight. Some of the stones on our list, such as peridot or ...

Just how much is the most expensive diamond in the world? We listed the five most valuable diamonds to give you an idea. Of all the valuable gemstones money can buy, diamonds are the most prized. Over ...

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 ...