916 hallmark gold price trends in Mumbai The 916 hallmark gold price in Mumbai fluctuates daily due to various factors such as international gold rates, currency exchange values, and local demand. Hallmark gold, known for its certified purity, is a preferred choice for both jewellery buyers and investors. Hallmark Gold, KDM and 916 Gold - Know the difference between Hallmark, KDM and 916 Varieties of Gold. Also check daily rates of Gold. 916 gold, also known as 22-Karat gold, is a type of gold used widely in making jewelry. 22-carat gold is called ‘BIS 916’ gold. The number 916 represents the purity of gold in the final product – 91.6% pure gold in a 100 gram alloy (a mixture of metals). 916 hallmark gold refers to gold certified by the BIS as 91.6% pure. The hallmark includes several necessary marks which we will explore, such as the BIS mark, the purity or fineness mark, and the jeweller's identification mark.