It is a D color, internally and externally flawless diamond. This diamond was named the Centenary Diamond to mark the Centennial Celebration of De Beers Consolidated Mines in 1988 when it was presented as rough. It weighs 273.85 carats and is valued at about $100 million. It was the third largest diamond to be produced from the Premier mine in 1986. Its rough weight was an astonishing 599 carats.