West Perth diamond developer and producer Dwyka Diamonds Ltd will move to 70 per cent ownership of the De Beers Tailings joint venture, under an agreement with South African company Kolong Investment Holdings Pty Ltd.

West Perth diamond developer and producer Dwyka Diamonds Ltd will move to 70 per cent ownership of the De Beers Tailings joint venture, under an agreement with South African company Kolong Investment Holdings Pty Ltd.