The rarest gemstones in the world are extraordinary treasures formed under rare geological conditions, making them highly sought after for t...

Revisit the Farnese Blue, the Blue Moon of Josephine, Mrs. Paul Mellon's blue and more memorable blue diamonds at Sotheby's.

The 102.34 carat rock, cut from a stone mined in Botswana, has been hailed as the 'rarest white diamond' ever to come to market. It is on display at Sotheby's Diamonds in London.

View auction details, art exhibitions and online catalogues; bid, buy and collect contemporary, impressionist or modern art, old masters, jewellery, wine, watches, prints, rugs and books at sotheby's auction house

Timed to coincide with the 40th-anniversary celebrations of Sotheby’s operations in Asia, the auction house announced in August 2013, the sale of two extremely rare diamonds at its Magnificent Jewels and Jadeite Autumn Sale 2013, coming up on October 7, 2013, at the Hong Kong Convention and Exhibition Center. One of these diamonds bearing Lot [...]

By Erika Winters 122.52-carat blue diamond recovered at the Cullinan mine Petra Diamonds announced the recovery of a 122.52-carat blue diamond at the Cullinan mine in South Africa. The diamond […]

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Marvellous selection of exquisite and rare green and blue diamonds with variations in their tone, hue and saturation from Novel’s…

The Blue Moon Diamond, which was discovered in South Africa in January 2014, has been on display at the he Natural History Museum in Los Angeles, but will be sold in Geneva in November.