BIS hallmark and HUID explained for jewellers and customers
The marks that prove purity — and how to talk about them.
Updated 7 October 2026 · 3 min read
A BIS hallmark on gold jewellery has three parts: the BIS logo, the purity (for example 22K916) and a 6-digit HUID code that is unique to that piece. Customers can check the HUID in the free BIS Care app. Hallmarking makes the purity you sell easy to trust.
The three marks
- BIS logo — the Bureau of Indian Standards mark.
- Purity — for example 22K916, 18K750, 14K585.
- HUID — a 6-character code, unique for every hallmarked piece.
How customers check it
- Install the free BIS Care app.
- Choose “Verify HUID”.
- Type the 6-character code from the jewellery.
- The app shows details of the item and the hallmarking centre.
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Use it in your marketing
- Add “100% BIS hallmarked” to your WhatsApp profile and posters.
- Post a short Status showing where the HUID is on a ring or chain.
- Explain the purity marks with the chart in our 916 guide.
Read: 916 gold meaning.
Questions
What does HUID stand for?
Hallmark Unique Identification — a 6-character code given to each hallmarked piece.
Can customers check HUID online?
Yes, with the free BIS Care app from the Bureau of Indian Standards.
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