The Diamond, cut from a 122.52-carat stome found at Petra Diamond’s (L:PDL) Cullinan mine in South Africa in Y 2014, is the largest of 4 Blue Diamonds made from the original rough stone.

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 1/2 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 2 highly significant Diamonds, which can be found in the British Crown Jewels.

Since acquiring a majority stake in the mine in Y 2008, Petra Diamonds has found some high-profile Blue Diamonds, including “The Blue Moon of Josephine,” which sold in November for $48.5-M and “The Star of Josephine”, a 7.03 carat polished gemstone that sold in Y 2009 for $9.49-M, representing what at the time was a world record price per carat of $1.35-M.

Have a terrific week.