A rough diamond the size of a chicken egg has been discovered at a mine in South Africa.
Petra Diamonds Ltd., a miner of the stones in Africa, unearthed the gem at the Cullinan mine near Pretoria.
Initial reports suggest the stone may be among the 20 largest “high quality” rough diamonds ever discovered.
“Initial indications are that it is of exceptional color and clarity, which suggest extraordinary potential for its polished yield,” Chief Executive Officer Johan Dippenaar said in a statement today.
The 507.6-carat stone, weighing more than 100 grams, may sell for more than €14m, Brock Salier, an analyst at Ambrian Partners Ltd. in London estimated.
“That would probably be a guide,” Dippenaar said, when asked about the estimate. “We certainly hope it’s not that little.”
The stone was found alongside three other valuable diamonds, with miners also unearthing a gemstone of 168.00 carats and two other stones of 58.50 and 53.30 carats.
The three stones may fetch more than €7m, according to Salier.
The world’s biggest certified diamond was also found at the Cullinan Mine, the 3,106-carat Cullinan was unearthed in 1905 by miner Frederick Wells.
It was later cut to form the Great Star of Africa and the Lesser Star of Africa, both of which are now set in the British Crown Jewels.
In May Petra sold a 7.03-carat blue diamond, cut from a 26.58-carat rough stone found at the mine, for $9.48m (€6.51m).