The BIS Hallmark is a certification mark issued by the Bureau of Indian Standards (BIS), which is operated by Government of India, these would include major urban centers like Mumbai, Delhi, Chennai, Kolkata, Hydrabad and various regions of the states of India. It verifies the purity of gold, silver, and platinum jewelry sold across India, ensuring compliance with set purity standards... https://www.corpzo.com/bis-hallmark-registration