LONDON, Aug 21: Gold prices hit a one-week high on Thursday, fortified by investor buying as oil prices rose, the dollar slipped, equities fell and on expectations of strong physical demand over coming months. Gold rose to $824.20 an ounce, the highest since August 14, and was up at $820.90/821.90 an ounce from $810.35/811.75 late in New York on Wednesday.—Reuters