RAPAPORT... Dubai’s Stargems Group has acquired two South African mines in an effort to expand its presence across the diamond supply chain.The diamond-sourcing and supply company recently purchased Reinet Investments, a Luxembourg-based business run by luxury tycoon and Richemont chairman Johann Rupert, Stargems chairman Shailesh Javeri told Rapaport News Sunday.Reinet owns stakes in two mining p...