How much money is a blue hope diamond worth?

If you have one for sale, it is worth whatever someone will pay you for it.

According to Jeffrey E. Post, mineralogist, National Museum of Natural History -- current owner of the Hope Diamond, in his blog, he indicates that the Hope Diamond is priceless.

In April 2013, "A stunning blue diamond (5.3 carats) broke a world record today, fetching a price of 6.2 million British pounds (about $9.6 million), or about $1.8 million per carat, according to auctioneer Bonhams."

This means that if ever available, a blue diamond the size of the Hope -- not the colour, but the ice-blue colour as above -- weighing in at 45.52 carats. could be purchased at auction, possibly, for at least £81.936 or more depending on the colour and clarity of the large blue diamond.