Maseru: Africa has unearthed yet another eyebrow-raising mega-rock—this time a 198 ct. white type IIa diamond described as of “exceptional quality.”

The stone was found at the Letšeng mine in Lesotho, said owner Gem Diamonds. The diamond “displays no fluorescence and is expected to achieve an exceptional price when sold this year,” the company said.

Spokesperson Sherryn Tedder said she could not comment on the diamond’s value, but referred to comparable large high-quality diamonds sold from Letšeng. The closest was a 162.02 ct. stone that sold for $11.1 million, and a 161.31 ct. that sold for $7.5 million.