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- Bleu Royal, an extremely rare large blue diamond, sold for the equivalent of some R800 million on Tuesday.
- At 17.61 carats, it is the largest internally flawless fancy vivid blue gem ever sold on auction.
- It was bought by an anonymous collector, after seven minutes of bidding.
An exceptionally rare blue diamond went under the hammer in Geneva Tuesday, selling for the equivalent of R800 million, making it one of the most expensive diamonds ever sold at auction, Christie's said.
Weighing 17.61 carats, the Bleu Royal is the largest internally flawless fancy vivid blue gem ever to appear for sale in auction history.
It is the star lot in a series of luxury sales in Geneva this month, which also feature items from movie history including pearls worn by Audrey Hepburn and Marlon Brando's self-engraved watch.
The Bleu Royal had been expected to fetch at east R640 million in Christie's Magnificent Jewels auction.
After an intense seven-minute bidding round between three potential buyers, it was snapped up by an anonymous private collector for 39.505 million Swiss francs, or just over R800 million at current exchange rates, including tax and fees.
"We are extremely pleased," Max Fawcett, Christie's head of jewellery in Geneva, told AFP shortly after the final hammer came down.
The gem, he pointed out, had sold for nearly $2.5 million per carat, making it "the most expensive jewellery lot sold in all of 2023" by any auction house worldwide.
And historically, "it is in the top-10 most expensive lots ever sold in terms of jewellery," he said.
The pear-shaped diamond, set on a ring, has been in a private collection for decades, and Tuesday's sale marked the first time it went to auction.
Before Tuesday's sale, Christie's international head of jewellery Rahul Kadakia highlighted the gem's extraordinary colour.
He pointed out to AFP that many modern coloured diamonds had a modified cut to enhance the colour.
In the Bleu Royal's case, "the rough material itself was so rich that they were able to cut it into a classic brilliant faceting style," he said.
"It checks all the boxes -- really top of its class," he added.
Fancy vivid blue diamonds weighing more than 10 carats are exceptionally rare. Since Christie's was founded in 1766, only three such stones have appeared for sale -- all in the last 13 years.
One of them was the Oppenheimer Blue, which fetched $57.5 million at a 2016 auction, and is the only diamond Christie's has ever sold for more than Tuesday's Bleu Royal.
Competing auction house Sotheby's meanwhile sold the De Beers Cullinan Blue last year, for just over $57 million.
A separate online jewels sale, which runs until November 16, features the pearl necklace worn by Hepburn in the 1953 film "Roman Holiday".
Hepburn, who played a princess in the romantic comedy, picked it out from a selection offered by the Austro-Hungarian jeweller Furst, and returned it afterwards with a signed photograph.
It is being sold by a European collector and has a starting price of 18,000 Swiss francs.
