The price for an ounce of gold rose $7.80 or 0.5 percent to settle at $1,612.40 Tuesday on the Comex division of the New York Mercantile Exchange. Silver prices added 7 cents to close at $28.92 an ounce. The dollar index rose 0.45 percent to 83.03 on the International Exchange. Against the dollar, the euro was at $1.287 from Monday\'s $1.2956. Against the yen, the dollar was lower at 95.08 yen from 95.21 yen.