What Is Hallmark Gold? BIS Hallmark Meaning & Importance

Hallmark gold is gold certified by the Bureau of Indian Standards (BIS) for its exact purity. The BIS hallmark — now a 3-part mark with a unique HUID code — is mandatory for gold jewellery sold in India since June 2021. It protects buyers from under-karated gold and supports better resale value.

A hallmark on gold, simply put, is an official stamp of approval. When a piece of gold jewellery, coin, or bar carries a hallmark, it means the purity of that gold has been independently tested and confirmed by a certified authority. You are not just taking the jeweller's word for it. A third party has checked it and stamped it.

BIS stands for Bureau of Indian Standards, which is a government body responsible for setting quality standards across various industries in India, including gold. The BIS licenses assaying and hallmarking centres across the country, and only gold tested at one of these licensed centres can legally carry the BIS hallmark, which is what keeps the certification meaningful.

A hallmark exists primarily as a consumer protection tool. It tells the buyer exactly how much pure gold is in the item they're paying for, removing the need to simply trust a seller's verbal claim about purity. This matters because gold jewellery almost always contains some proportion of other metals, and without independent verification, there's no reliable way for a buyer to know that proportion.

Hallmarking became mandatory across India from 16th June 2021, for jewellers with a turnover above a defined threshold. Since that date, gold jewellery and artefacts sold by covered jewellers must carry a valid BIS hallmark before they can legally be sold.

Before 2021, the hallmark included four symbols, including the BIS logo, purity grade, the assaying centre's mark, and the jeweller's mark. The new system replaced all of this with just two marks, the BIS logo and the HUID number. This made the system simpler and much harder to fake.

The pre-2021 hallmark carried four separate components on every piece, each serving a different verification purpose:

• BIS logo (triangle) — confirming the piece had gone through BIS certification at all.
• Purity/fineness grade (e.g., 22K916) — the actual purity number, same as today.
• Assaying centre mark — identifying which testing centre certified the piece.
• Jeweller's mark — a unique identifier for the specific jeweller who sold it.

The assaying centre mark and jeweller's mark were often difficult for consumers to interpret without specialist knowledge, since neither was designed to be looked up or verified independently by an ordinary buyer standing in a store. This complexity led directly to the simplified new format introduced in 2021.

The Hallmark Unique Identification number is a six-digit alphanumeric code. Every hallmarked piece has its own unique HUID, which makes it traceable. You can verify this code on the BIS Care app to confirm the jewellery is genuine, without needing to interpret any other symbols.

The new format, introduced in 2021, reduced the hallmark to just two components: the BIS logo, and the HUID in place of the old assaying centre and jeweller marks. Rather than needing to decode two separate identifier marks yourself, buyers now look up one code that returns everything at once, the registered purity, jeweller name, and hallmarking centre for that specific piece, verifiable online via the BIS CARE app or the BIS portal at bis.gov.in, in under a minute.

Alongside these format changes, the purity code itself is worth understanding on its own, since it's the part of the hallmark that actually tells you what you're buying:

22K916 means 91.6% pure gold, 18K750 means 75% pure, and 14K585 means 58.5% pure, with the remaining share made up of alloy metals like silver, copper, or zinc that add strength and durability. You'll rarely see 24K (99.9% pure) gold hallmarked for jewellery specifically, since gold at that purity is too soft to hold its shape under everyday wear, which is why jewellers alloy it down to 22K, 18K, or 14K before crafting anything meant to be worn regularly.

Checking a hallmark takes two forms: a quick physical inspection of the piece itself, and a digital verification through the BIS CARE app for full confirmation.

Check the inner surface of the jewellery for a small stamped mark. On rings it is usually on the inside of the band. On bangles and chains, it is typically on the clasp or a flat section of the piece. Pendants usually carry the mark on the reverse side, and coins on the flat face or edge, since these are the flattest, most stampable surfaces on each item.

Once you find the stamp, look for the fineness number. If it says 916, your jewellery is 22K gold. If it says 750, it is 18K. A genuine BIS mark shows the triangular BIS logo followed by this purity code, clearly and precisely engraved, with sharp, even edges rather than a blurry or uneven stamp. Since these marks can be quite small, a 10x loupe or magnifying glass makes them much easier to read, especially on thinner pieces like chains where the stamped area is only a few millimetres across.

Download the BIS Care app, enter the six-digit HUID number, and it will show you the details of that specific piece, including the jeweller's name, purity, and certification details. This is the most reliable way to verify what is hallmarked jewellery you are holding, since it draws on the official BIS database.

Here's the process broken into steps:

• Step 1: Download the BIS CARE app, available on both Android and iOS, free of charge.
• Step 2: Open the app and select 'Verify HUID' from the main menu.
• Step 3: Enter the 6-digit alphanumeric HUID printed or engraved on the jewellery.
• Step 4: The app displays the registered purity, jeweller name, and hallmarking centre for that piece.
• Step 5: Cross-check this displayed purity against the mark stamped on the jewellery. If they match, the gold is genuine BIS-certified.

This works for all gold articles hallmarked after 2021, since the HUID system didn't exist before then. If you'd rather not use the app, the same verification is available through the BIS portal at bis.gov.in, using the same HUID number.

For a gold chain specifically, check the clasp or a flat link, since the rest of the chain is usually too thin and curved to stamp clearly. For a gold coin, check the flat face or the edge, where the mark is typically small but legible under a loupe.

When buying gold jewellery, you'll often hear three terms used loosely, and sometimes interchangeably, though they mean quite different things: hallmark gold, KDM gold, and 916 gold. Sorting out the confusion between them helps you buy with more confidence.

The most common point of confusion is worth stating plainly: 916 gold and hallmark gold aren't two competing types of gold, and one doesn't replace the other. 916 is a purity grade, describing what fraction of the metal is gold. Hallmark is a certification system, confirming that the stated purity, whatever it is, has been independently verified. A piece of 916 gold can be hallmarked or not; a piece of hallmarked gold is very often, though not always, 916.

KDM is a type of gold alloy containing cadmium as a soldering material. It was widely used for making intricate gold jewellery, since cadmium made the joining process easier for detailed designs. KDM gold is no longer preferred due to health hazards. Cadmium is toxic and can cause respiratory and skin-related issues in artisans handling it. As a result, the BIS banned cadmium soldering in 2000, replacing it with hallmarked gold jewellery, which uses safer soldering alloys instead. You're unlikely to encounter genuinely new KDM gold today, though older pieces bought before the ban may still be in circulation.

This distinction matters in practice when you're comparing two pieces of jewellery. If a jeweller describes a piece as "916 gold" without mentioning a hallmark, that's a purity claim you can't independently verify, unless the piece also carries a BIS hallmark and HUID you can check. Genuinely hallmarked 916 gold gives you both pieces of information at once: the purity grade and the independent proof that it's accurate.

For most buyers today, the practical takeaway is simple. KDM gold is effectively obsolete and worth avoiding if you come across it in older pieces, mainly for the health and safety history behind it rather than any purity concern. 916 gold signifies 22-karat gold, comprising 91.6% pure gold and 8.4% alloyed metals, such as silver, copper, or zinc, to enhance its strength and durability. What actually protects you as a buyer, regardless of purity grade, is the hallmark itself, since that's the only one of the three that represents independent verification rather than a description of composition.

Understanding hallmark gold isn't just a technicality, it changes how confidently you can buy, sell, and hold gold as part of a broader financial picture. Five reasons stand out.

• Purity assurance: you know exactly what percentage of gold you're paying for, verified by an independent BIS-recognised centre rather than taken on the jeweller's word alone.
• Fraud protection: without a hallmark, there is no independent proof of the gold's purity. You are relying entirely on what the jeweller tells you. A hallmark removes that risk completely. Non-hallmarked gold may be under-karated without you ever knowing.
• Better resale value: hallmarked gold is easier to sell, gets better buyback rates, and faces fewer disputes. Any jeweller or platform across India will accept hallmarked gold without hesitation. Lenders prefer hallmarked gold or 916 gold (22-karat) when applying for a gold loan too, since verified purity makes it straightforward to calculate your eligible loan amount under RBI's current tiered LTV framework, up to 85% for smaller loans and 75% for larger ones.
• Legal protection: mandatory hallmarking means sellers are accountable under the BIS Act, 2016, and selling gold with a fake or missing hallmark, where hallmarking is required, is a punishable offence, not just a customer-service issue.
• Investment confidence: when gold is part of a broader financial plan rather than just an ornament, certified purity ensures the asset actually holds the value you think it does, both today and whenever you eventually sell or pledge it.

That fifth point matters more than it might first appear. Gold can complement a diversified investment portfolio alongside mutual funds and other instruments, and its value as an asset only holds up if its purity is genuinely what it's claimed to be. An uncertified piece might look identical to a hallmarked one, but the two can carry meaningfully different resale and loan value. If you're weighing physical, hallmarked gold against other ways of holding gold as an investment, such as digital gold or gold-backed instruments, Aditya Birla Capital's investment planning resources can help you compare your options.

A little in-store diligence goes a long way alongside checking the hallmark yourself, especially at a jeweller you haven't bought from before.

• Ask the jeweller for their BIS licence number and check that it's displayed at the store, since only BIS-licensed jewellers can legally sell hallmarked gold in India.
• Request a proper invoice that separately lists the purity, weight, making charges, and HUID, rather than a single bundled figure that hides how the total was arrived at.
• Watch for red flags: a purity mark with no matching HUID, a jeweller who is reluctant to let you verify the code on the spot, or pricing that seems too good for the stated purity and weight.
• If in doubt, verify the HUID on the BIS Care app before you pay, not after you've already left the store, since disputes are far harder to resolve once you've walked out.

Also Read: 1 Bhori Gold in Grams - Conversion, Price & Buying Guide