Joe Raedle/Getty ImagesDonald Trump is great for gold. Or, at least, the uncertainty around him winning the presidential elections in November is, according to Greg Collett, the World Gold Council's director of investment products. The council is sponsor of the SPDR Gold Trust, the largest exchange-traded fund in the world that's backed by gold. The possibility that the presumptive Republican nominee wins the election could heighten the type of concern that drives investors to invest in the metal as a safe haven. "He's very unclear in his policies and uncertainty tends to make people say, "maybe I should have something a little bit in gold,"" Collett told Business Insider.