By Kavya Guduru Summary Companies Gold set for third straight monthly gain Fed policy decision due on Feb. 1 POLL-High interest rates to hold back gold's rally Jan 31 (Reuters) - Gold prices fell 1% on Tuesday to a more than one-week low as the dollar firmed, while investors kept a close watch on the U.S. Federal Reserve's interest rate hike decision and policy outlook. Spot gold dropped 1% to $1,904.29 per ounce by 1124 GMT, its lowest level since Jan. 19. However, bullion has gained 4.3% so far in January, putting it on course for a third straight monthly rise. U.S. gold futures were down 1% at $1,904.00.

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