The Hope Diamond

Weight - 45.52 carats (9.104 g)
Currently at - Smithsonian Natural History Museum in Washington DC
Features - Fancy dark grayish-blue, clarity was determined to be VS1, with whitish graining present. The cut was described as being "cushion antique brilliant with a faceted girdle and extra facets on the pavilion.
Source - India

Blue Hope - 45.52 Carats, the ironically named Hope diamond (named for its purchaser, Henry Thomas Hope) may have had a long and illustrious history before it became associated with a run of bad luck for its owners.
It is thought to be a part of the famous Blue Tavernier Diamond, brought to Europe from India in l642. The Blue was purchased by King Louis XIV who had it cut to 67.50 carats from 112 carats to bring out its brilliance. The diamond was stolen during the French Revolution, and a smaller diamond of similar color was sold in 1830 to Hope, an English banker. After inheriting the diamond, Hope's son lost his fortune.
It was eventually acquired by an American widow, Mrs. Edward McLean, whose family then suffered a series of catastrophes: her only child was accidentally killed, the family broke up, Mrs. McLean lost her money, and then committed suicide. When Harry Winston, the New York diamond merchant, bought the stone in 1949, many clients refused to uch the stone.