Gold edged lower on Tuesday, tracking a weaker euro, as wary investors focused on whether Greece will be able to convince Europe to grant a much-needed bailout and Moody's warning on some European nations' ratings rekindled contagion fears. Spot gold edged down 0.4 percent to $1,715.70 an ounce by 0717 GMT, after a gain of 0.1 percent in the previous session. US gold also fell 0.4 percent to $1,718.20.