BIS Hallmarking and the 6-Digit HUID: What It Actually Guarantees

The six-digit alphanumeric code stamped into your gold bangle or necklace is called the HUID, Hallmark Unique ID, and it exists because the older system had a problem. Before 2021, hallmarked gold carried a purity mark but no individual identifier, which meant a batch of jewellery could be tested as a group and still contain pieces that had not been individually verified. The HUID fixed that by tying each piece to a single entry in the Bureau of Indian Standards portal, logged at the moment of testing.

When a jeweller sends a piece to a BIS-recognised Assaying and Hallmarking Centre, the centre tests the gold, assigns a unique six-digit alphanumeric code, and uploads the result. The BIS portal stores the purity grade, the centre that tested it, the date, and the jeweller's registration number. Nothing in that record can be altered after upload. The HUID is not a brand promise, it is a timestamped government log entry. You can read the full record yourself by entering the code at the BIS Care app or the BIS portal at bis.gov.in. The check takes under a minute and costs nothing.





A fully hallmarked piece carries three marks. The BIS logo, a triangle with a line through it, confirms the jeweller is registered. The purity grade in karats or fineness tells you the gold content: 22K gold reads as 916, meaning 91.6 percent pure gold by weight. The six-digit HUID is the third element. Older pieces may carry a fourth mark, the year letter, but BIS phased that out when the HUID was introduced, because the portal timestamp now carries that information. If a piece shows only a purity stamp without a BIS logo or HUID, it has not been hallmarked under the current mandatory system.


The HUID guarantees that the specific piece in your hand was tested at a recognised centre and recorded as meeting the stated purity. It does not guarantee the weight of the piece, the quality of the stone settings, the craftsmanship, or the making charges the jeweller quotes. Purity and price are separate conversations. A 22K hallmarked piece is genuinely 91.6 percent gold by weight, that part is locked. The gram rate and the making charge are negotiated at the counter and the hallmark has nothing to say about either. The mark also does not cover gold coins sold by non-BIS-registered dealers, which is why coins bought from unregistered sources occasionally carry stamps that look official but are not linked to any portal record.



BIS made hallmarking mandatory for gold jewellery sold by registered jewellers in phases starting June 2021, covering 14K, 18K, and 22K. Jewellers below a certain turnover threshold and those in districts not yet covered by a hallmarking centre were initially exempt, but the government has progressively expanded coverage. The practical implication: if you are buying from a registered jeweller in a major city, every piece should carry a HUID. If a jeweller offers you a piece without one and cannot explain why, that is a reason to ask before paying. The BIS portal can also verify whether a specific jeweller's registration is active.

Open the BIS Care app, tap Verify HUID, and type the six digits. The record that comes back should show the purity matching what the jeweller told you, a hallmarking centre name, and a date before today. If the code returns no record, the stamp was not registered, which should not happen on a mandatory-hallmarked piece. If the purity on the portal differs from what the jeweller stated, you have found a discrepancy worth raising before any money changes hands. The check is not about distrust; it is about using a system the government built specifically so buyers do not have to take purity on faith.