The miner said it would examine De Beers’s value in light of sluggish demand for diamonds as it seeks to exit the business.

Anglo American Plc expects to take a writedown on its De Beers operations, as plunging diamond sales prompt output cuts and complicate its plan to exit the business.Most Read from BloombergCitadel to

Mining giant Anglo American has cut forecasts for its rough diamond output over the next two years, as demand for the stones continues to wane.

The London-listed miner announced Thursday that it will review De Beers’s value as it looks to exit the business, citing persistently weak diamond demand. Last year, Anglo reduced De Beers’s book value by $1.6 billion to $7.6 billion.