Spot gold prices are lower and spot silver prices are modestly lower after the close Tuesday, as a firmer U.S. dollar and renewed Middle East uncertainty kept bullion under pressure while U.S. equities advanced to record highs. At the time of writing, spot gold was trading near $4,507.40 an ounce, down 1.38%, while spot silver was trading near $76.975, down 1.41% on the session.