The 10th International Exhibition on Gold, Gems, Jewelry, Related Machinery and Equipment opened in Isfahan on Tuesday. The four-day expo hosts 130 firms from Italy, Turkey, the UAE, Austria, India, the United States and Japan, alongside domestic jewelry-makers and gold producers from Tehran, Qazvin, Hormozgan, Yazd, Khorasan Razavi and Alborz provinces, IRNA reported. Iran is home to various world-class gold mines boasting about 1.5 million tons of reserves.