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.

The 555.55 carat black diamond has belonged to its current owner for two decades but little is known about its history before that. A billion-year-old black diamond, believed to be the largest cut ...

Black Diamond apples (Malus Domestica ... produce fruit two months out of the year and it's clear why they are both expensive ...