Gems made this way are significantly less expensive than naturally black diamonds. Celebrities wearing black diamond jewelry are fueling the rise in popularity of this unusual stone. The Most ...

Soon after this rebranding, Chocolate Diamonds took off ... 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.

12 SUVs With the Most Reliable Engines Here’s a look at the most expensive diamonds ever purchased and their current owners. Also, check out the most expensive pieces of jewelry. The Graff Pink, a ...

Neither Princess Diana or Meghan Markle own the the most expensive royal engagement ring. Someone outside the House of ...

Following is a transcript of the video. 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.