Mumbai, October 25: With the beginning of five days of festival of lights Thursday, the optimism with respect to firming up of gold prices in the domestic market is also picking up. However, besides sentiments, there are several other reasons for the gold prices to rise. These includes US-China trade war stress, delayed Brexit solutions, Geo-political tensions and slow down in Global growth. All these factors augur well for the gold prices in the international market and as its subsequent effect in the domestic market signals firm trend during the next 12 months, analysts said.