Initiative seeks contributing to global efforts in preventing the use of child and forced labour in the mining supply chain, and to providing information needed to demonstrate the responsible sourcing of minerals and metals.
Draft bill gives government first option to buy unusually large diamonds found in the country's mines, such as the world's second-biggest 1,109 carat diamond discovered by Lucara two years ago.
International watchdog group Global Witness says political elites and security forces have controlled and secretly exploited Zimbabwe's diamond sector for over a decade.