Pumpkin Diamond ($3 million)
Discovered in 1997 and purchased for $1.3 million by Ronald Winston for the House of Harry Winston, the Pumpkin Diamond measures 5.54 carats and is rated a Fancy Vivid Orange by the Gemological Institute of America. (Winston chose the name because he bought the stone the day before Halloween.) Now worth an estimated $3 million, the Pumpkin Diamond was worn by Halle Berry to the 2002 Oscars when she won best actress for Monster's Ball.
Flawless Blue Diamond ($9.5 million)
In 2009, Sotheby's Geneva sold a flawless blue diamond for $9.5 million, setting a record for that color at auction and the largest amount ever paid per carat for any gemstone at auction. Weighing 7.03 carats, the rectangular diamond went to an anonymous buyer on the telephone who battled with another bidder for 15 minutes.
Sun-Drop Diamond ($10.9