Precious metals mostly gained on Friday trading session after a government report showed that the world's largest economy rose slower in the last quarter of 2013 and as China's currency weakened pushing demand from the region lower. Silver for settlement in May rose 0.2% to $21.31 an ounce, palladium surged 0.1% to $744.50 an ounce, while platinum fell 0.2% to $1,450.30 an ounce.