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Geneva, Switzerland--A 228.31 carat pear-shaped diamond will easily be the top lot at Geneva Magnificent Jewels sale, which will be held on May 11 at the Four Seasons Hotel des Bergues. This exceptionally rare gemstone was mined and polished in South Africa more than two decades ago and is the largest white diamond ever to appear for sale at auction.

Known simply as “The Rock,” its estimate is $20 million to $30 million. If this price is realized, it will be among the most valuable white diamonds ever sold at auction.

“The Rock will join the very best of the legendary gemstones which have been passed through Christie’s global salerooms since 1766,” Rahul Kadakia, Christie’s International Head of Jewellery, said in a statement. “The market for diamonds is particularly vibrant and we are confident that this sensational gemstone will capture the attention of collectors across the globe this spring season.”

Graded by the Gemmological Institute of America as G color, VS1 clarity, The Rock is also accompanied by a letter from the GIA stating that it is the largest existing D-Z color pear-shaped diamond ever graded by the laboratory, Christie’s said. The previous auction record for the largest white diamond was a 163.41 carat gem, which sold at Christie’s Geneva in November 2017 for $33.7 million.

The Rock was unveiled at Christie’s Dubai. It will then be on display in Taipei followed by Christie’s New York Rockefeller Plaza headquarters from April 29 till May 1. The Rock will then be shown to the public during Christie’s Luxury Week at the Four Seasons Hotel des Bergues Geneva from May 6 - 11.