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.

From sparkling multi-million-dollar diamonds to custom designs, here are the most expensive diamond rings in the world that ...

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