A rare 10.11 carat orangy-pink diamond is causing a stir in Canada. The stone is the top lot in a jewelry auction being held by Circa Auctions at the Park Hyatt hotel in Toronto, Ontario on October 3rd. The Toronto Star reports that is is the most expensive diamond ever auctioned in Canada. It is estimated to bring in $2.5 million to $3 million Canadian. The fancy intense organy-pink cushion cut stone came from the Argyle mine in Australia (famous for its pink diamonds) and is rated as a VS2 stone meaning it has some small inclusions. The Star article says that the Sultan of Brunei is said to have the largest collection of pink diamonds. The purchase includes "naming rights" to the stone.