A 24.18-carat intense blue diamond known as The Cullinan Dream has just sold for $25.4 million at Christie’s Magnificent Jewels auction in New York, breaking all records and becoming the most expensive gem of its kind ever sold at auction.
The diamond, cut from a 122.52-carat rock found at Petra Diamond’s (LON:PDL) Cullinan mine in South Africa in 2014, is the largest of four blue diamonds made from the original.
The Cullinan Dream, a cut-cornered rectangular mixed-cut diamond, has been classified by the Gemological Institute of America as Type IIb. Those kinds of gems are very rare and account for less than one-half of 1% of all diamonds found in nature.
Type IIb gems contain a small amount of the element boron trapped in the crystal carbon structure during their formation that can give rise to a blue or grey coloration, Petra Diamonds said in a statement.
The mine is best known for the discovery of the Cullinan diamond, at 3,106 carats the largest rough diamond ever found. The gem was cut into two highly significant diamonds, which can be found in the British Crown Jewels.
Since acquiring a majority stake in the mine in 2008, Petra Diamonds has found some high-profile blue diamonds, including “The Blue Moon of Josephine,” which sold in November for $48.5 million and “The Star of Josephine” — a 7.03 carat polished stone that sold in 2009 for $9.49 million, representing what at the time was a world record price per carat of $1.35 million.