BIS Hallmark & HUID Explained: What Gold Sellers Should Know in 2026

Gold jewellery is not valued only by its appearance or weight. Purity plays an important role in determining its value, which is why hallmarking has become an essential part of buying and understanding gold jewellery in India.

If you have recently purchased gold, you may have noticed markings such as the BIS logo, 22K916, or a unique six-character HUID engraved on the jewellery.

But what exactly do these markings mean? And if you are planning to sell old gold, does having a hallmark or HUID affect the selling process?

Here is a simple guide to understanding BIS hallmark gold, HUID numbers and what gold owners should know in 2026.

What Is BIS Hallmark Gold?

BIS stands for the Bureau of Indian Standards, India’s national standards body.

Gold hallmarking is a system used to indicate that the purity or fineness of a gold article has been assessed according to applicable standards. BIS operates India’s hallmarking scheme through recognized Assaying and Hallmarking Centres.

In simple terms, when you see a BIS hallmark on eligible gold jewellery, it gives you standardized information about the declared purity of that jewellery.

This is particularly useful because two jewellery pieces that look almost identical may contain different proportions of pure gold.

What Does a BIS Hallmark on Gold Jewellery Show?

Under the current HUID-based system, hallmarked gold jewellery carries key identifying marks, including the BIS Standard Mark, the purity/fineness grade, and a six-character alphanumeric HUID unique to the hallmarked item.

For example, you may see a marking such as:

22K916

Here:

22K represents the karatage of the jewellery.

916 indicates a fineness of 916 parts of gold per 1,000 parts, corresponding to 22-karat gold.

Similarly, jewellery of other purity levels can carry different fineness markings.

What Is HUID?

HUID stands for Hallmark Unique Identification.

It is a six-character alphanumeric identification number that is unique to a hallmarked jewellery article and is traceable within the hallmarking system.

Think of it as an identification code attached to that particular hallmarked gold item.

For example, a HUID may look something like:

AB12C3

This is only an illustrative example; the actual code will vary for every hallmarked item.

Why Is HUID Important?

Before the HUID system, consumers primarily relied on the hallmark symbols engraved on their jewellery.

HUID adds another layer of traceability to the hallmarking system because each hallmarked article receives its own unique identification.

Consumers can use this number to verify information about the hallmarked item through BIS’s official system.

This can be useful both when purchasing jewellery and later when checking the details of gold you already own.

How to Verify a Gold HUID Number

One of the useful features available to consumers is the ability to verify HUID through the official BIS Care App.

The process is straightforward:

BIS specifically provides the Verify HUID facility for consumers to check the authenticity and related details of HUID-bearing hallmarked jewellery.

What Does 916 Mean on Gold Jewellery?

This is one of the most common questions among gold owners.

If your jewellery is marked 22K916, it indicates that its declared fineness is 916 parts per thousand, commonly associated with 22-karat gold.

In percentage terms, this corresponds to approximately 91.6% gold content.

The remaining portion consists of other metals used in the alloy.

Pure gold is relatively soft, so gold jewellery is commonly made by combining gold with other metals to provide the characteristics required for jewellery.

Is 916 Gold the Same as 22K Gold?

Yes, 916 fineness corresponds to 22K gold.

You can think of these as two ways of expressing purity:

22K → Karat measurement

916 → Fineness measurement

So if you see 22K916 on a piece of jewellery, both markings relate to the same declared purity grade.

Does a BIS Hallmark Guarantee the Selling Price?

This is where gold sellers should understand an important difference.

A hallmark provides information related to the declared purity of the jewellery. It does not guarantee a particular resale price.

When you sell old gold, the value can depend on factors such as:

Therefore, having hallmarked jewellery does not mean that the original purchase price or a particular market rate is automatically guaranteed when you sell it.

Will Gold Still Be Tested If It Has a BIS Hallmark?

A gold buyer may still evaluate the jewellery before making an offer.

The hallmark provides important purity information, but a buyer may conduct a purity assessment as part of the transaction and valuation process.

This can be particularly relevant for older jewellery, jewellery that has undergone repairs or alterations, or items where the buyer needs to establish the actual recoverable gold content before purchasing them.

For consumers who independently want an assay, BIS says jewellery or samples can also be tested at BIS-recognized Assaying and Hallmarking Centres on a chargeable basis, with an assay report issued.

Can You Sell Gold Without a BIS Hallmark?

Older jewellery may not always carry the current BIS hallmark or HUID format.

The absence of a hallmark does not by itself tell you the exact purity of the jewellery. In such cases, purity testing becomes particularly important when establishing its gold content.

Therefore, if you have inherited jewellery, very old jewellery, or an item without a visible hallmark, its value can still be assessed based on actual purity and net gold weight.

What If the HUID Is Not Visible?

Gold jewellery can be very small, and hallmark engravings may not always be easy to see with the naked eye.

If you cannot identify the HUID clearly, you can have the item examined using suitable magnification.

For jewellery that you believe should carry a HUID, you can also use the BIS verification resources once you identify the code.

Does a Hallmark Expire?

According to BIS consumer guidance, the hallmark on hallmarked jewellery remains valid for the lifetime of the jewellery.

That means a hallmark does not simply expire after a few years.

However, if jewellery has subsequently been materially altered, repaired or modified, a current evaluation may still be relevant when it is being sold.

What Changed in Gold Hallmarking in 2026?

Gold hallmarking requirements in India continue to evolve.

BIS lists a Hallmarking of Gold Jewellery and Gold Artefacts (Amendment) Order, 2026, dated March 2, 2026, including the addition of seven districts under the mandatory hallmarking framework. BIS also lists a further amendment dated April 28, 2026.

This is one reason consumers buying or selling gold in 2026 should rely on current BIS information rather than older articles about hallmarking requirements.

Why Should Gold Sellers Understand Hallmarking?

Understanding hallmarking helps you know more about the jewellery you own before you decide to sell it.

Before approaching a gold buyer, check:

Purity marking: Look for markings such as 22K916.

HUID: Identify the six-character code where applicable.

BIS verification: Use the BIS Care App to verify HUID details.

Weight: Know approximately how much your jewellery weighs.

Current gold rate: Understand the market context, while remembering that market rate and final selling value are not necessarily the same.

This gives you a better foundation for understanding the valuation offered for your gold.

BIS Hallmark vs Gold Purity Testing: Are They the Same?

Not exactly.

BIS Hallmark provides standardized information about the purity/fineness associated with the hallmarked jewellery.

Gold purity testing is the process of evaluating an item to determine its gold content during an assessment.

Both are related to purity, but they serve different purposes.

If you are selling old jewellery, the buyer may evaluate the jewellery’s purity and weight before determining the final value.

Selling Hallmarked Gold in Chennai

If you are planning to sell hallmarked or old gold jewellery in Chennai, understanding your jewellery’s hallmark, purity and weight can make the valuation process easier to follow.

At Thangapanam, customers can have their gold evaluated based on factors such as purity and weight before deciding whether to proceed with the sale.

Whether your jewellery carries 22K916, a HUID, an older hallmark, or needs further purity assessment, understanding these details beforehand can help you make a more informed decision.

Conclusion

The BIS hallmark and HUID system gives Indian consumers a standardized way to understand and verify important information about hallmarked gold jewellery.

A BIS hallmark relates to certified purity information, while the HUID provides a unique identification for a hallmarked jewellery item.

If you own gold jewellery, check its hallmark and HUID and use official BIS resources when you want to verify the information.

And if you are planning to sell old gold, remember that the hallmark is only one part of the process. Actual purity, net gold weight, applicable gold rate and the valuation process can all influence the final selling value.

Know Your Gold Before You Sell

Understand your gold’s hallmark, purity and weight before selling. Get a transparent gold valuation at Thangapanam.

Trusted gold buyer in Tamil Nadu.
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