Spot gold edged lower on Friday, still on course for its biggest weekly rise in two months after the eurozone's last-minute deal on containing debt crisis buoyed commodities and equities. Spot gold retreated from a one-month high of $1,751.99, falling to $1,736.44 an ounce by 0701 GMT, down 0.4 percent from the previous close. The metal remains on course for a 5.9-percent gain from a week earlier, the biggest one-week rise in two months.