A pink diamond the size of a postage stamp is going on the auction block, and it's estimated to bring as much as $28 million.
The 16.08-carat gem is poised to set a record for a cushion-shaped fancy vivid pink diamond when Christie's offers it at its Magnificent Jewels sale in Geneva on Nov. 10.
The auction house said it is the largest diamond of its kind to come to auction.
