Gold extended gains to a third session on Thursday, scaling fresh six-month highs as investors sought to hedge their bets against geopolitical tensions in Ukraine and economic slowdown fears in China. Spot gold rose 0.4 percent to $1,371.76 an ounce by 0737 GMT, after jumping 1.3 percent on Wednesday. The metal earlier on Thursday hit $1,374.85, its highest since September 10.