The Graff Pink is a rare 24.78 carat pink diamond, once owned by American celebrity jeweller Harry Winston.
The diamond, mounted in a ring, was sold by Sotheby's auctioneers in Geneva, Switzerland on 16 November 2010.
Before its sale, the stone was expected to enter the list of the top ten most expensive diamonds in the world;[1] on selling for US $46 million (£29 million) it became the most expensive single jewel ever sold at auction at that time.
[2][3][4] The gem is classified by the Gemological Institute of America as "fancy intense pink"—a high colour rating for pink diamonds—and has been assessed as Diamond type IIa, placing it in the top two per cent of the world's diamonds.
The diamond was shown around the world prior to the auction in Geneva.