Due to the tightening physical supply of silver and escalated investment demand, Citi estimated silver prices to continue rising in the coming months. The 3-month silver forecast has been raised from USD38 per ounce to USD40, while the 6-12 month forecast has been lifted to USD43.Meanwhile, Citi reiterated a more cautious stance on gold in the belief that its peak may have already passed. It predicted that gold prices would fall below USD3,000 per ounce next year.Silver futures for September last climbed by 0.2% or USD0.075 to USD38.185 an ounce.