A white diamond labeled "The Rock," reported to be the largest to hit the auction block, will be up for sale on May 11 in Geneva, Switzerland.
The diamond is will be part of an auction by Christie's that has two stones with weights over 200 carats, according to a report.
"The Rock" is a pear-shaped cut weighing a reported 228.31 carats.
It is nearly the size of a golf ball and is expected to fetch a price of at least $30 million, according to the auctioneer.
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"Often with these largest stones, they sacrifice some of the shape in order to keep the weight," said Max Fawcett, the head of Christie’s jewelry department in Geneva. "This is a perfectly symmetrical pear-shape form and ... one of the rarest gems ever to be sold at auction."
The precious stone is a product of a South African mine, and it was previously worn in a Cartier necklace, the report noted.
With its weight, "The Rock" has a good chance of breaking the previous white diamond auction record of 163.41 carats, which was sold in 2017.
Along with "The Rock," Christie's reported it is auctioning a yellow cushion-shaped diamond named "The Red Cross Diamond."
The latter weighs in at 205.07 carats, according to the report.
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Russia's invasion of Ukraine has buoyed diamond prices, and a portion of the sales from the auction will be gifted to the Geneva-based International Committee of the Red Cross, according to the auctioneer.