Angola has proposed to buy Anglo American's 85% stake in De Beers, competing with other potential buyers like Botswana.
Anglo American has valued De Beers at $4.9bn after $3.5bn in impairments over two years.
Anglo American has chosen not to comment on the discussion.
Anglo American is divesting its majority stake in De Beers, a process started 17 months ago.
Author's summary: Angola proposes to buy De Beers stake.