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.
It was never going to be sold. The Harry Winston Company wanted to make a necklace with the hope diamond.
The Hope Diamond is a blue diamond.
The Hope Diamond is basically a blue diamond.
The Blue Hope Diamond.
BLUE!
All the carats in the Hope Diamond are classified as blue-gray.
There is a famous diamond of about this weight called the Hope Diamond.
The diamond becomes Blue because of Boron, this microelement is trapped into the diamond lattice. See the link below for other famous Blue diamonds.
You may read this for history of Blue Hope diamond: http://www.diamond-jewelry-pedia.com/blue-hope.html
Because of its size -- 45.22 carats -- and colour -- blue or blue-gray.
French Blue is a nickname for the Hope Diamond, which is currently at the Smithsonian.
The Hope Diamond was found to glow red after being exposed to a UV light. The impurities of the diamond cause it to glow, the same impurities that give it a blue color normally.
No. The film Titanic may be what you reference in your question. The blue diamond in the film was a fabrication of the screenwriter. In the real Titanic tragedy, there was no 'Hope diamond'. The (one and only) Hope Diamond is safely displayed in the Smithsonian Natural History Museum in New York City.