Pure gold prices gained by Rs355 on North Korea tensions to close at Rs30,260 per 10 grams against Rs29,905. : Mumbai: Riding on firm global trends and increased buying by local jewellers at the Mumbai bullion market, gold prices advanced by Rs355 per ten grams, while silver prices soared Rs690 per kg at the bullion market in Mumbai on Monday. Silver reclaimed the Rs40,000-mark per kg due to good speculative offtake amid heavy industrial demand. Standard gold (99.5 purity) climbed by Rs355 to close at Rs30,110 per 10 grams from last Friday’s closing level of Rs 29,755.