The huge diamond shown here is the Tiffany Diamond, the largest diamond currently on display in the U.S. It recently made its debut at the Smithsonian’s National Museum of Natural History in Washington. The 128.54 carat cushion-cut stone is on loan from Tiffany & Co. until Sept. 23. On top of hte stone is a gem-encrusted bird which was designed in the early 1960′s by Jean Schlumberger. It is gold and platinum with white and yellow diamonds and a ruby eye. The priceless yellow diamond has only been worn twice, once by a Rhode Island socialite and once by actress Audrey Hepburn in a promotion for the film “Breakfast at Tiffany’s.” The rough stone was discovered in South Africa in 1877 and was 287 carats before cutting.