Pearls, black opal, and chocolate diamonds are highly sought after gems. ... High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones.

That explains the budget-busting cost of high-end black pearls. Adjoining the museum, which is free to the public, is the Robert Wan jewellery store. There, a strand of large, uniformly round ...

But the Black Pearl is the OG and, until Koru, was the world's second-largest sailing yacht.Total length is 350 feet (106 meters), with three 229-foot (70 meters) carbon masts part of a DynaRig ...

A natural black pearl is more expensive-and mysterious- than its classic off-white cousins. And for good reason: Although manufacturers can dye pearls black, it takes extremely rare conditions to ...