| Weight | 273.85 carats (54.770 g) |
|---|---|
| Color | Grade D colorless |
| Cut | Modified heart-shaped brilliant |
| Country of origin | South Africa |
| Mine of origin | Premier Mine |
| Discovered | 17 July 1986 |
| Cut by | Gabi Tolkowsky, Jim Nash and Geoff Woolett |
| Original owner | De Beers |
| Owner | Unknown |
| Estimated value | at least USD 90 million |
The De Beers Centenary Diamond is, at 273.85 carats (54.770 g), the third-largest diamond to have been produced in the Premier Mine. Among top-color diamonds, only the Cullinan I and II are larger than the Centenary diamond.[1] The Centenary Diamond is rated in color as grade D color by the Gemological Institute of America, which is the highest grade of colourless diamond and is internally and externally flawless. It was named the Centenary Diamond as it was presented in the rough for the Centennial Celebration of De Beers Consolidated Mines on 11 May 1988. The Centenary Diamond was unveiled in final form in May 1991.