Metal Concentrators SA (Pty) Ltd is the guarantee of purity & authenticity. We are esteemed members of both the South African Jewellery Council as well as the Responsible Jewellery Council . We supply Gold, Silver, Platinum & Palladium. We refine all forms of precious metal waste. Our casting division offers CAD designing, casting and finishing of jewellery to the trade. Buy Gold Bars online with Metal Concentrators.