Gold prices dipped for a third straight session on Monday as the dollar firmed near six-month highs and weighed on the yellow metal, while market participants await more clarity on the US interest rate trajectory. Spot gold was down 0.4% at $4,051.31 per ounce, as of 0353 GMT. US gold futures for December delivery edged 0.8% higher to $4,047.70 per ounce.