Botswana is conducting due diligence on HB Antwerp, as the world’s top diamond-producing country by value seeks to finalize a deal to acquire a 24% shareholding in the Belgian gem trader, President Mokgweetsi Masisi said on Monday. At the height of talks for a new sales contract with De Beers in March, Botswana announced a deal to become a shareholder in HB Antwerp and to supply the trader with 10% of the rough diamond output