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Gold fell by 1% to $1,380.60 an ounce and silver slid 1.6% to $22.30 an ounce.
Dollar gained 0.4% against six major currencies before US data released today that economists say will show consumer confidence improved and home prices gained.
Central banks including Russia and Kazakhstan added gold to reserves in April, International Monetary Fund data showed. Bullion holdings in exchange-traded products are set for a fifth monthly drop.
Gold has slumped 18% this year, while the dollar rallied 5.2% against a six-currency basket on speculation the Federal Reserve may scale back quantitative-easing measures that helped bullion cap a 12-year bull run in 2012.
Raising interest rates or curbing bond buying too soon would endanger the recovery, Fed Chairman Ben S Bernanke said. He also said the pace of bond purchases could be reduced in the next few meetings if the jobless rate keeps dropping.
