Called the “Lulo Rose,” the diamond was found at the Lulo alluvial diamond mine, the mine’s owner, the Lucapa Diamond Company, announced on its website.

The pink gemstone is expected to fetch a high value when auctioned, but Wetherall said he doesn’t know what kind of premium will be paid because of its color.

Lulo is an alluvial mine which means the stones are recovered from a river bed. The Lucapa company is searching for the underground deposits, known as kimberlite pipes, which would be the main source of the diamonds, said Wetherall, speaking from the company’s headquarters in Australia.

About 400 staff are employed at the Lulo mine which has already produced the two largest diamonds ever found in Angola, including a 404-carat clear diamond.

The pink gemstone is the fifth largest diamond found at the mine where 27 diamonds of 100 carats or more have been found. The pink diamond will be sold by international tender by the Angolan state diamond marketing company, Sodiam. Angola’s mines make it one of the world’s top 10 producers of diamonds.

The pink diamond is an impressive size but many clear diamonds are larger than 1,000 carats. The Cullinan diamond found in South Africa in 1905 tips the scales at 3,106 carats and it’s in the British Sovereign’s Scepter.

According to nbcnews