(Bloomberg) -- Anglo American Plc said it could take an impairment on its De Beers diamond unit after the sector was hit by a collapse in prices last year and any recovery this year is expected to be slow.Most Read from BloombergCitadel Among Hedge Funds That Got Morgan Stanley’s Block-Trading LeaksTesla Asks Which Jobs Are Critical, Stoking Layoff FearsChina Replaces Top Markets Regulator as Xi Tries to End RoutXi’s Markets Shakeup Surprised Insiders, Showing Alarm Over RoutUS Commercial Real E