The Centenary is one of the world’s largest modern cut diamond weighing 273.85 carat, measured 39.90 × 50.50 × 24.55 mm, and had 247 facets – 164 on the stone and 83 around its girdle.
The Gemological Institute of America (GIA) (Read here for GIA gemologist class) graded its color as D (Read here for color of Diamond) and its clarity as Flawless. The rough diamond weighed 599 carats and was found in July 1986 in the Premier Mine in South Africa.
Using the most sophisticated electronic cutting instrument at that time it took the famous master cutter Mr. Gabi Tolkowsky three years to prepare, cut and polish this stone.
The equipment used for cutting this stone is specifically designed to hold it securely with pipes to circulate cooling liquid. The small blue wire is connected to a 9 thermal probe to monitor the temperature generated during the cutting process.
The Centenary Diamond is owned by De Beers Consolidated Mines Limited and was unveiled for public view for the first time in London on May 1st 1991 by De Beers’ Deputy Chairman Mr. Nicky Oppenheimer.
What a stunning beauty in so small a stone….