BIS Bureau of Indian Standards Hallmark
India's national standards body. Hallmarking is mandatory for gold jewellery, and a BIS-hallmarked piece carries the BIS logo, its purity grade (for example 22K916) and a 6-character HUID code.
How it proves authenticityEvery HUID is registered to that single piece. Enter it in the BIS Care app to see the jeweller, purity and item details, so the gold is tested, not just claimed.











