However, most fine specimens are carefully preserved by mineral collectors and rarely faceted. The dazzling gemstone Benitoite flawlessly completes the list of the world's rarest gemstones. Found only ...

Explore the timeless allure of the world’s most expensive diamonds. Learn about their value, rarity, and why they’re ultimate ...

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 ...

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.