Sotheby's is set to host a significant High Jewelry Sale in Geneva on May 12, 2026, highlighting an extraordinary 6.03-carat fancy vivid blue diamond from South Africa's renowned Cullinan mine. This rare gemstone, making its auction debut, carries a pre-sale estimate of $9 million to $12 million. Complementing this unique blue diamond, the auction will also feature a meticulously matched pair of unmounted brilliant-cut white diamonds, each weighing 18.38 carats. These white diamonds, both exhibiting exceptional clarity—one flawless and the other internally flawless—are valued between $2.8 million and $3.5 million. Sourced from Botswana's Jwaneng mine, these diamonds represent a special collaboration between Sotheby's and De Beers, aimed at bringing new, top-tier flawless diamonds to the global market.

This sale follows the successful auction of 'The Jwaneng 28.88,' a 28.88-carat brilliant-cut diamond from the same collaboration, which fetched $2.7 million in Hong Kong. The upcoming Geneva auction underscores the continued demand for rare and high-quality diamonds, offering collectors and enthusiasts a chance to acquire pieces with significant provenance and exceptional characteristics.

Extraordinary Blue Diamond and Flawless White Diamond Pair to Lead Sotheby's Geneva Sale

Sotheby's upcoming High Jewelry Sale in Geneva on May 12, 2026, will be headlined by an exceptionally rare fancy vivid blue diamond, weighing 6.03 carats, originating from the esteemed Cullinan mine in South Africa. This internally flawless gemstone is set to make its inaugural appearance at auction, with an estimated value of between 7.2 million and 9.6 million Swiss Francs (equivalent to 9 million to 12 million US Dollars). The blue diamond's rarity, combined with its perfect internal clarity and vibrant color, positions it as a centerpiece of this highly anticipated event, drawing global attention from collectors and investors alike. Its origins from the Cullinan mine, known for producing some of the world's most famous diamonds, further enhance its desirability and historical significance.

In addition to the remarkable blue diamond, the auction will showcase a perfectly matched pair of unmounted brilliant-cut white diamonds. Each of these exquisite diamonds weighs 18.38 carats, with one certified as flawless and the other as internally flawless, both exhibiting a D color grade, indicating their exceptional quality. The estimated value for this pair ranges from 2.2 million to 2.8 million Swiss Francs (or 2.8 million to 3.5 million US Dollars). These white diamonds are a product of an exclusive partnership between Sotheby's and De Beers, specifically from Botswana's Jwaneng mine. This collaboration aims to introduce a series of significant, newly discovered flawless diamonds with impeccable provenance to the auction market. The previous success of 'The Jwaneng 28.88,' which sold for $2.7 million in Hong Kong, sets a promising precedent for these offerings, highlighting the strong market appetite for such peerless gems.