Gold prices rose on Thursday, supported by a weaker dollar, while investors weighed growing optimism over a potential US-Iran deal to end the war that has pushed up energy prices and fuelled fears of higher inflation. Spot gold rose 0.7% to $4,821.44 per ounce by 0301 GMT. US gold futures for June delivery gained 0.4% to $4,844.40. The US dollar hovered near its lowest level in six weeks, ma