The Heart of Eternity is a member of an exceedingly rare class of coloured diamonds . It was found in the Premier Diamond Mine of South Africa . The Premier mine is the only mine in the world with an appreciable production of blue diamonds . Of the ten coloured diamonds that drew the highest bids , six of those ten were blue diamonds , rating values as high as $ 550,000 to $ 580,000 per carat ( $ 2750 &ndash; 2900/mg ) . The Heart of Eternity was unveiled in January 2000 as part of the De Beers Millennium Jewels collection , which included the Millennium Star . The Heart of Eternity was featured with ten other blue diamonds ; the collection of blue diamonds totalled 118 carats ( 23.6 g ) . The De Beers Millennium Jewels were displayed at London ’s Millennium Dome throughout 2000 . An attempt on 7 November 2000 to steal the collection was foiled
An attempt
Millennium Dome raid
Heart of Eternity