According to SAFAL TRADING, Gold costs increased by Rs 172 to Rs 30,049 per 10 grams in futures deale today as investors involved in increasing their wagers amongst a firm international trend and increased buying by jewelers at the domestic spot markets. At the Multi commodity Exchange, gold for distribution in Dec was trading higher by Rs 172 or 0.58 % to Rs 30,049 per 10 grams in a business revenues of 93 lots.   The gold for distribution in far-month Feb the coming season too obtained Rs 159 or 0.53 % to Rs 29,879 per 10 gm in 2 lots. Market experts linked the rise in gold costs at futures trade business to positive international cues as well as pick up in demand at the domestic spot markets.   Yesterday, Gold HNI Calls costs zoomed by Rs 900 to business at three-year high of Rs 31,750 per 10 grams in the national capital. Meanwhile, gold was trading greater 0.41 % greater at USD 1,283.50 an oz in Singapore.