Low productivity and the concomitant costs are harming the local beneficiation industry.
Botswana's industry is sparkling compared with its neighbour's declining sector.
The Oppenheimer dynasty has ended by selling their 40% of De Beers to global miner Anglo American for $5.1-billion.
Big money arriving in the country has resuscitated old rivalries among the political elite.
The country is eager to rid itself of a large stockpile and could deliver 25% of global supply.
Angola's diamond sector is slowly recovering but gem prices still need to rise by around 15% this year to enable companies reinvest in it.
It wouldn't be fitting to mount a barrage of "sale" and "special offer" signs in the windows of jewellers crowded into Antwerp's diamond square mile.
'Watertight' investments in diamond mines and real estate spring a major leak.
The world's largest diamond group, De Beers, said its three shareholders have agreed to loan the company $500-million.
De Beers Consolidated Mines has begun consultation with labour unions about possible retrenchments, the world's largest diamond miner said on Friday.
More than 1 200 job cuts are looming in South Africa's diamond mining industry, trade union Solidarity said on Friday.