Russia’s largest diamond miner Alrosa discovered a unique diamond weighing 158.2 carats and worth over $1.5 million, the company said on Tuesday, Sept 25.

The diamond was found in September at diamond-mining factory No. 16 of the Nyurbinsk ore mining and processing enterprise in the Republic of Yakutia in Russia’s north-east.

“In the estimate of Alrosa’s specialists, this diamond may be sold for over $1.5 million at auction. This diamond, if it is processed, may also produce several quality diamonds, each of them worth over several hundred thousand U.S. dollars,” Alrosa said in a statement, RIA Novosti reported.

Alrosa is one of the world's largest diamond companies, accounting for about 28 percent of global production, and produces 97 percent of all diamonds in Russia.