Jeff Koons at Christie’s on Sale
For $12 million. There are five: blue, green, red, pink, and yellow (this one is currently being processed). The green, red and pink belong to private collectors. The blue diamond is currently on exhibit in front of the Christie's building.
NOTE: Buyer of (blue) diamond, please contact me if you would like to purchase the hi-res versions of these photos. I can give you a deal ;) (cheaper than $13 million).