This 9.75-carat blue diamond set two world records when it was auctions for $32.5 million dollars at Sotheby’s Thursday. (Sotheby’s)In the past, Consumerist has reported on some high-priced, heavily sought-after auction items –– there was the most valuable stamp that sold for $9.5 million and the world’s most expensive bottle of whiskey priced at $628,205.