One of the world's finest blue diamonds, the Oppenheimer Blue, is going up for auction in May. It's expected to get bought for 26.5 million and 31.3 million pounds ($38 million and $45 million dollars).
It's going to be up for auction along with the blue De Beers Millennium Jewell 4 Diamond, which might go for 25 million pounds (around 35 million dollars).
I don't think I'll be bidding on either. It'd be nice to see them on display, though.