(CNN) -- Miners in Africa unearthed one of the largest diamonds ever found.

The diamond weighs 910 carats, making it the fifth-largest gem-quality diamond ever found.

It's likely worth tens of millions of dollars.

The diamond was found inside a mine in the tiny African nation of Lesotho. The mine is known for producing large, high-quality diamonds.

London-based Gem Diamonds owns a majority stake in the mine.

The company says the diamond is of extremely high quality.