China, the world's biggest importer of most major commodities, has already made several attempts to stall a surge in prices for everything from iron ore to coal.
The African nation's heavy reliance on diamonds, which account for a fifth of the Botswana's GDP and more than two thirds of its foreign exchange income.
China's recycled steel imports hit 114,741 million tonnes in May, more than 28 times the volume seen in January when the country lifted import restrictions on ferrous scrap.