“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 ...

GENEVA -- The "Oppenheimer Blue" diamond sold Wednesday for more than 56.8 million Swiss francs ($57.6 million) including fees, crushing the previous record for the most expensive diamond ever sold at ...

Blue diamonds are considered the rarest and most desired on the market. A particularly big one sold for millions at Sotheby’s on Thursday, scraping just beneath the surface of its $26 million ...

Africa-focused Petra Diamonds (LON: PDL) has unearthed an ultra-rare blue diamond weighing just under 42 carats at its Cullinan Mine in South Africa, a discovery that could sell for as much as $40 ...