LONDON (MarketWatch) -- Gold futures rose above the psychologically key $1,500 mark on Tuesday. Gold for August delivery GC1Q +1.38% gained $21.20 to $1,503.80 an ounce in electronic trading on Globex. Silver prices also advanced, with silver for September delivery SI1U +2.92% up $1.01, or 3%, to $34.72 an ounce. On Wall Street, U.S. stock futures pointed to a slightly higher opening after the long holiday weekend.
