The most active gold contract for December delivery fell 4.1 U.S. dollars, or 0.25 percent, to close at 1,640.7 dollars per ounce.
Rising U.S. treasury yields also dampened gold.
The Federal Reserve's monetary policy meeting starts Tuesday and ends Wednesday. Investors are waiting for comments from Fed Chairman Jerome Powell at the meeting, as well as signs to confirm expectations that the central bank will shift to smaller interest-rate hikes after an expected rate hike of 75 basis points in November.
The latest Chicago purchasing managers index, the Chicago Business Barometer, dropped to 45.2 in October from 45.7 in September, giving gold some support.
Silver for December delivery fell 2.8 cents, or 0.15 percent, to close at 19.119 dollars per ounce. Platinum for January delivery fell 19 dollars, or 2 percent, to close at 930.1 dollars per ounce.
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