Gold prices edged lower on Tuesday as investors exercised caution before a series of central bank meetings this week, with the Federal Reserve taking center stage. Spot gold fell 0.5% to $2,639.56 an ounce, while gold futures for February delivery dropped 0.6% to $2,653.81 an ounce. The precious metal has been trading between $2,600 and $2,700 as traders await rate decisions from the Fed, Bank of Japan, and Bank of England.