LIST

The Centenary Diamond was discovered in De Beers ’ Premier Diamond mines in July , 1986 , but it wasn ’ t unveiled to the world until March 1988 – two years later . The plan was to unveil the diamond during a celebration of De Beers Consolidated Ltd .’ s 100-year anniversary . The diamond was rather aptly named the Centenary Diamond . Cutting the rough diamond took 10 months , with thirteen different designs presented before completion in 1991 , with the final heart shape design unveiled to the world . Following its inauguration , the Golden Jubilee Diamond was insured for $ 100 million – but it ’ s true value has never been evaluated . Where is the Golden Jubilee Diamond today ? Through a policy of anonymity , De Beers has never disclosed this information .

First discovered in the Central African Republic , the Spirit of de Grisogono weighed in at 587 carats . The name represents the black diamond cutting specialist De Grisogono . It took a year to cut down the rough diamond into the 312.24 ‘ Moghul-cut ’. This was then set on a white gold ring mounting with 702 smaller white diamonds , an additional 36.69 carats . Like many of the diamonds on this list , the whereabouts of the Spirit of de Grisogono remain unknown . There were rumours that the founder of De Grisogono jewellers sold the diamond but no confirmation has ever been given .

24 July 2016