A huge 118 carat, flawless diamond has gone on display in New York.
The diamond, which has been cut into an oval shape, is expected to smash white diamond sale records when it goes up for auction in Hong Kong next month, Sotheby's says.
"It's almost 20% larger than the next largest, so it's a honker," an auction house spokesman told the New York Daily News.
Chin Yeow Quek, the chairman of Sotheby's jewellery division in Asia, says the gem is expected to sell for between US$28 million and US$35 million (NZD$35 - $44 million).
This would be the highest price ever recorded for a white diamond, exceeding the $26.7 million Harry Winston paid for a 101.73 carat stone in May.
The stone, mined in an undisclosed nation in Africa, was cut from rough measuring around 299 carats, Jewelers Circular Keystone reports.
Sotheby's also said the current owner of the "remarkable egg sized" diamond wishes to remain anonymous.
However, the auction winner will get "naming rights" to the stone.