The Reserve Bank of Zimbabwe has stockpiled 300,000 carats of diamonds under new regulations which compel miners to pay half of their royalties using commodities, the state-run Sunday Mail reported. Central bank governor John Mangudya also told the Harare-based newspaper that gold reserves stood at around 350 kilograms, or around $20 million in US dollars. The value of the diamond stockpile is hard to quantify, he added. Zimbabwe introduced regulations last year that require miners to pay