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There is really only one diamond with this name, the Koh-in-Noor Diamond.
Mother Nature made the world's biggest diamond.
You can read more about the Great Exhibition of 1851 at the Crystal Palace where the Kor-i-noor diamond was on display. At the time, that was the largest diamond known. The exhibition intended to display the 'works of industry of all nations'. As to why this diamond in this exhibition, that detail is lost to history, unless one wants to consider the Kor-i-noor diamond a 'trophy' example on display from the India colony. You can read more, below.
africa........north
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.