At over 18 carats, the vividly coloured gem is the largest pear-shaped pink diamond of its quality ever to be offered for sale at auction, the Christie's auction house said.
The diamond, which goes under the hammer for the first time on November 8, has been estimated at between $25 million and $35 million. The sparkling pink tear-drop-formed stone, which has been mounted on a ring flanked by a large white diamond on either side, weighs exactly 18.18 carats.
