No, the Hope Diamond is not the most expensive diamond in the world. While it is one of the most famous and valuable diamonds, there are other diamonds that are more expensive due to their size, clarity, and color.
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mam diamond
It is the Princies Chrities Diamond.
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The most expensive phone in the world is the Black Diamond iPhone 5. It is plated with gold and encrusted with over 26 carats of diamond. The excessive piece cost its buyer 15.3 million dollars.
Generally Diamond can be termed as an expensive stone, the size would matter, bigger the stone higher the cost.
Probably not, because it is not a named diamond, so no value for it is available publicly.
The most expensive diamond, by definition, is priceless.
The largest in existence was 755.5 carats, and they cost about $4,000 a carat, so it would cost about $3,022,000
Red diamonds - are the rarest and most expensive.
I think that would be the Hope Diamond. It's not the biggest or most expensive, but over the years it's had a lot of press.