Quick Answer · Purity
What is BIS hallmark and is it mandatory?
BIS Hallmark is a certification by the Bureau of Indian Standards confirming the purity of gold jewellery. Since 16 June 2021, BIS hallmarking is mandatory for all gold jewellery sold in India. Every piece must show: the BIS logo, purity grade (916, 750, 585), the assaying centre mark, and a unique 6-digit HUID (Hallmark Unique ID).
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