A cushion-cut diamond ring is set to be the star performer at an upcoming New York auction.
Christie's expects the 22.79-carat colourless jewel to fetch between $2 million and $3 million (£1.3 million and $1.9 million) at the event, entitled All the Colors of the Season.
Specialising in clear and pigmented diamonds, the catalogue of 210 lots also includes a pear-shaped Fancy Intense Pinkish Orange ring weighing 10.91 carats, embellished with half-moon white diamonds, as well as an oval-cut Burmese ruby and diamond ring.
Christie's estimates the total amount made from the auction will be more than $20 million, with items between $600 and $6 million going under the hammer at the sale on December 7th at the Big Apple's famous Rockefeller Center.
Another recent Christie's auction held in Hong Kong this week broke the record for the most expensive item ever sold at an Asian auction.
The Perfect Pink diamond was bought by an anonymous bidder at the event for $23.2 million.