AHC: Assaying and Hallmarking Centres in India, Role and Process
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Every hallmarked ornament in India passed through a laboratory most buyers have never heard of. The AHC full form is Assaying and Hallmarking Centre: the BIS-recognised facility where jewellery is actually tested and stamped, the working end of the entire hallmarking system. Jewellers do not hallmark their own gold. They submit it to an AHC, the centre assays the purity, and only then does the piece receive the triangle, the grade and the HUID that buyers rely on. This guide explains what an assaying and hallmarking centre does, walks the testing process step by step, decodes what the resulting marks show, and covers why AHC-certified purity quietly speeds things up when the same jewellery is later pledged with a lender such as IIFL Finance.
What Is an Assaying and Hallmarking Centre?
An AHC is a third-party laboratory recognised by the Bureau of Indian Standards to test precious metal purity and apply the official hallmark. That third-party position is the whole point. The jeweller who profits from a purity claim does not get to certify it; an independent centre does, under BIS oversight, with its equipment, methods and records subject to the Bureau's requirements. India's network of recognised centres has grown steadily as mandatory hallmarking expanded district by district, reaching 380 districts by March 2026, and now runs to well over a thousand centres across the country, with the live list maintained on the BIS portal.
The Role of an AHC in Gold Hallmarking
The centre sits between the jeweller and the buyer, and its job has three parts. Testing: verifying that submitted jewellery actually meets the declared purity grade, 22K916, 18K750 and so on. Marking: applying the hallmark, by laser or press, once the batch passes. And recording: registering each piece's unique HUID in the BIS system, which is what makes a modern hallmark checkable from a phone years later. A jeweller who wants to sell hallmarked jewellery in a mandatory district has no route around this. The AHC is the gate.
The Assaying Process Step by Step
- Submission. The jeweller registers the batch with the centre, declaring the purity grade each article claims.
- Homogeneity check and sampling. The centre examines the lot and draws samples according to BIS norms, so the testing represents the batch honestly.
- Assay. Purity is measured, XRF analysis for speed, and fire assay, the centuries-old reference method, where the standard demands it. Fire assay remains the most accurate purity test in existence.
- Pass or fail. Articles at or above the declared grade proceed. Articles below it are rejected and returned unmarked.
- Hallmarking and HUID registration. Passing pieces receive the BIS triangle, the purity grade and a unique six-character HUID, each code registered in the central database.
- Return and records. The marked batch goes back to the jeweller, and the records stay with the system, which is why a buyer can verify a piece on the BIS CARE app long after everyone has forgotten the transaction.
What the Marks on Your Gold Jewellery Show
The current hallmark carries three components, all applied at the AHC: the BIS logo triangle, the purity grade such as 22K916, and the HUID. Enter that code in the BIS CARE app and the registered details appear, purity, article type, hallmarking particulars. Jewellery marked before the 2021 overhaul carries a larger set, including the assaying centre's own identification mark and the jeweller's, and those pieces are genuine; jewellers must simply re-hallmark old stock into the current format before reselling it. Either way, the stamp you are reading is the AHC's work, not the shop's promise.
Why AHC Certification Matters When You Apply for a Gold Loan
A loan appraisal is an assay too. Under the RBI's 2025 directions, the lender tests pledged gold in the borrower's presence and issues a certificate of purity, gross and net weight, deductions and value, with pricing at the published 22-carat benchmark and the loan inside LTV caps of 85% up to INR 2.5 lakh, 80% up to INR 5 lakh and 75% above. AHC-hallmarked jewellery moves through this fastest, because the branch machine and the registered purity agree, and disputes evaporate when the HUID resolves cleanly. Un-hallmarked gold still qualifies, the lender's own assay simply decides everything, but the borrower walks in with less certainty about the number coming out. The AHC's stamp, in other words, is pre-verification the borrower already paid for at purchase.
How IIFL Finance Can Help
IIFL Finance runs its Gold Loan on the borrower-present assay the rules require, and hallmarked jewellery makes that visit shortest. Bring the ornaments and KYC to a branch; the metal is tested in front of you, the certificate itemises purity, weights and value, and sanction follows within the RBI's tiered LTV caps, often the same day, with no income proof needed up to INR 2.5 lakh. Pledged jewellery is stored securely and returned within seven working days of closure under RBI rules. For families holding older, unstamped gold, the branch assay itself settles purity on the spot, so nothing needs hallmarking first; carrying invoices and any HUID details simply shortens the conversation, subject to eligibility and scheme terms.
Conclusion
The AHC is the quiet institution the whole hallmark rests on: the independent laboratory that tests what jewellers claim and stamps only what passes. Knowing it exists changes how you read the tiny marks inside a bangle. They are not decoration and not the shop's word; they are a laboratory's finding, registered piece by piece in a national database you can query from a phone. So buy hallmarked, verify the HUID before paying, and let old family gold be assayed when its value matters. Between the AHC at purchase and the branch assay at pledge, purity in India is now measured twice by people with no reason to flatter it. That is exactly what a buyer wants.
Frequently Asked Questions
What does AHC stand for in gold hallmarking?
Assaying and Hallmarking Centre: the BIS-recognised, third-party laboratory that tests jewellery purity and applies the official hallmark. Jewellers submit batches to an AHC, the centre assays them, rejects anything below the declared grade, and stamps passing pieces with the BIS triangle, purity grade and a registered HUID code. The independence is the point, since the party certifying purity is not the party selling it. Every genuine hallmark on Indian jewellery is an AHC's work product, checkable later on the BIS CARE app.
How many BIS-recognised AHCs are there in India?
Well over a thousand, and the number keeps growing as mandatory hallmarking expands, most recently to 380 districts in March 2026, since each new phase needs local testing capacity. The exact count changes through the year as centres are recognised or lapse, so the authoritative answer is the live list on the BIS portal, searchable by state and district. For a consumer, the practical point is coverage: most urban jewellery markets now have a centre within reach, which is what makes hallmarked stock the norm rather than the exception.
Can I get un-hallmarked gold jewellery tested at an AHC?
Yes. BIS provides for consumers to have their own gold articles tested at recognised centres for a modest fee, and the centre issues a report of the assayed purity, which is genuinely useful for old family jewellery bought before hallmarking became widespread. Note the distinction: testing tells you the purity, while hallmarking of new stock runs through registered jewellers. For most practical purposes, resale, exchange or a loan, the buyer's or lender's own assay serves the same role, done on the spot.
What is the difference between the AHC code and the HUID?
They belong to different eras of the hallmark. Before 2021, each hallmark included the assaying centre's own identification mark, the AHC code, alongside the jeweller's mark, so the stamp told you who tested the piece. The current system replaced that with the HUID: a six-character code unique to the individual article, registered centrally, and verifiable on the BIS CARE app, with the centre's identity held in the database rather than on the metal. Old-format hallmarks remain genuine; new purchases should carry the HUID format.
Does BIS hallmarked gold get a better gold loan amount?
Not a higher amount by rule, but a smoother, surer one. Loan value depends on assayed purity and net weight within RBI's LTV caps of 85%, 80% or 75% by slab, and the lender's own assay decides those numbers whether or not the piece is hallmarked. What the hallmark buys is agreement: the machine reading matches the registered grade, disputes vanish, and the appraisal moves faster. IIFL Finance values hallmarked and unmarked gold through the same borrower-present assay, subject to eligibility.
Disclaimer : The information in this blog is for general purposes only and may change without notice. It does not constitute legal, tax, or financial advice. Readers should seek professional guidance and make decisions at their own discretion. IIFL Finance is not liable for any reliance on this content. Read more
