One of the world's rarest diamonds, about the size of an egg or a large lollipop, is going up for auction next month and is expected to fetch $12 million to $30 million.
Sotheby's said on Thursday that the 102.39-carat diamond, a flawless white sparkler, was the second-largest oval diamond of its kind to be offered at auction.
The largest, a 118.28-carat diamond, set a record $30.8 million price when it was sold under the hammer in 2013.
'Diamonds of this caliber and size have sold anywhere between $11.9 million to $33.7 million,' said Quig Bruning, head of Sotheby's New York jewelry department.
Only seven such diamonds, known in the trade as D color flawless or internally flawless white diamonds, with over 100 carats have previously been sold at auction.
'More and more people have come to understand that something billions of years old and of the size of a lollipop can store as much value as a Rembrandt self-portrait or a Basquiat,' Gary Schuler, worldwide chairman of jewelry at Sotheby's, said in a statement.
The diamond will be sold in a single-lot action without a reserve price at Sotheby's in Hong Kong on October 5.