The Centenary Diamond was unveiled in final form May 1991. The Centenary Diamond D levels were classified on the basis of color as color by the Gemological Institute of America, which is the highest grade a diamond is colorless and internally and externally flawless. De Beers Centenary Diamond, at 273. 85 carat (54. 77 g), is the third largest diamond has been produced in the Premier Mine. The price of this diamond is about $ 100 million.
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