“We’re offering without reserve and without estimate,” he said, meaning the highest bid will be the winning bid with no minimum price.
Only seven other white diamonds of more than 100 carats — a carat’s mass is equal to 0.2 grams — and similar quality have appeared at auction, five of them with Sotheby’s.
In November 2017, the largest diamond ever presented at auction, with more than 163.41 carats, sold in Geneva for more than $33.8 million, fees and commissions included — a global record in this category.
But it’s not a record overall for a diamond: in April 2017, the giant “Pink Star” pink diamond sold for $71.2 million at a Sotheby’s auction in Hong Kong.
Collectors will be able to start bidding on September 15, with a starting price of only one Hong Kong dollar, or 13 US cents.