A 9.51-carat blue stone that once belonged to the heiress Bunny Mellon sold for $7 million less than at its last auction, a sign of profound shifts in the diamond industry. By Ashley Ahn A 9.51-carat ...

If you’re feeling blue, Christie’s has just the gem. The auction house is offering an extraordinarily large 31.62-carat blue diamond at the Magnificent Jewels sale in New York this June. The aptly ...

“The Mediterranean Blue,” a 10.3-carat fancy vivid blue diamond, sold for $21.5 million during Sotheby’s sale of high jewelry in Geneva on Tuesday. It was not only the top lot of the sale, but it was ...

The government of Botswana, which still owns the gem, tapped Valérie Messika, founder of her namesake company, to design a jewelry piece to highlight the stone. The result? A pendant necklace set with ...