The most active gold contract for December delivery rose 10.8 U.S. dollars, or 0.64 percent, to close at 1,686 dollars per ounce.
The National Federation of Independent Business (NFIB) Small Business Optimism Index rose to 92.1 in September from 91.8 in August. The reading also beats the 91.8 consensus forecast from economists, capping gold's growth somewhat.
Investors are also waiting for the U.S. September consumer price index, an important inflation barometer, which is due out on Thursday.
Silver for December delivery fell 12.8 cents, or 0.65 percent, to close at 19.487 dollars per ounce. Platinum for January delivery rose 3.3 dollars, or 0.37 percent, to close at 899.1 dollars per ounce.
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