Gold Hallmarks Explained: How to Verify Jewellery Purity

Buying gold jewellery is an important investment, whether you are choosing a wedding necklace, a diamond ring, an elegant bracelet, or a mangalsutra. While design, craftsmanship, and appearance often influence a purchase, understanding gold purity is equally important. A hallmark helps buyers identify the declared purity of gold and make a more informed decision when purchasing fine jewellery.

In India, gold hallmarking is administered by the Bureau of Indian Standards (BIS). The BIS hallmark indicates that the gold article has been assessed against applicable purity standards. Understanding hallmark symbols, carat markings, and the Hallmark Unique Identification (HUID) number can help you verify jewellery before making a purchase.

What Is a Gold Hallmark?  

A gold hallmark is an official mark indicating the purity or fineness of gold jewellery. It helps consumers distinguish jewellery marked to meet recognised purity standards from pieces whose gold content has not been independently verified through the hallmarking process.

In India, the BIS hallmarking system provides a framework for verifying the declared purity of gold jewellery. Hallmarked jewellery is tested through BIS-recognised Assaying and Hallmarking Centres before the hallmark is applied to qualifying articles.

When shopping for gold jewellery, checking the hallmark is an important step alongside reviewing the invoice, product specifications, and jeweller's credentials. You can learn more through the official BIS Hallmarking Overview.

Understanding Gold Purity: 24K, 22K, 18K and 14K

Gold purity is commonly expressed in karats (K) and fineness. Karatage indicates the proportion of gold in an alloy, while fineness expresses that proportion in parts per thousand.

The commonly encountered purity markings include:

• 24K999: Indicates a fineness of 999 parts per thousand, or 99.9% gold.

• 23K958: Indicates a fineness of 958 parts per thousand, or approximately 95.8% gold.

• 22K916: Indicates a fineness of 916 parts per thousand, or approximately 91.6% gold.

• 20K833: Indicates a fineness of 833 parts per thousand, or approximately 83.3% gold.

• 18K750: Indicates a fineness of 750 parts per thousand, or 75% gold.

• 14K585: Indicates a fineness of 585 parts per thousand, or 58.5% gold.

The remaining proportion consists of other metals used in the alloy. These influence characteristics such as colour, hardness, and suitability for different jewellery designs.

Which Gold Purity Is Best for Jewellery?

The ideal gold purity depends on the type of jewellery and how you plan to wear it. Higher-purity gold contains a greater proportion of gold, while lower-karat alloys contain more other metals, which can help provide additional hardness.

For diamond jewellery, the setting must securely hold the stones while complementing the overall design. This is why understanding both the gold purity and the craftsmanship of the setting is important when choosing an engagement ring, necklace, or bracelet.

The Three Main Marks on a Modern BIS Gold Hallmark

Since the introduction of HUID-based hallmarking, the modern BIS hallmark consists of three mandatory components.

1. BIS Standard Mark

The BIS logo identifies the hallmarking system under which the gold article has been tested and marked. Look for the genuine standard mark rather than relying only on a seller's verbal assurance or a generic purity stamp.

2. Purity and Fineness Mark

The purity mark identifies the declared gold grade. Examples include 22K916, 18K750, and 14K585.

Check that the mark corresponds with the purity stated on the product description and purchase invoice. Remember that a carat marking alone is not the same as a complete BIS hallmark.

3. Hallmark Unique Identification Number (HUID)

HUID is a unique six-character alphanumeric identification code assigned to an individual hallmarked jewellery article. It helps make the article traceable and can be checked through the official BIS Care app.

These three components provide a useful starting point for verifying gold jewellery before purchase.

How to Verify Gold Jewellery Purity Using the BIS Care App

One of the most practical ways to check a modern HUID-hallmarked article is to use the BIS Care app. The app includes a feature called “Verify HUID” for consumers.

Follow these steps:

1. Examine the jewellery and locate the HUID engraved as part of its hallmark.

2. Download or open the official BIS Care app.

3. Select the Verify HUID feature.

4. Enter the identification code as shown on the jewellery.

5. Review the returned information and compare the details with the item you intend to buy.

If the code cannot be verified or the details do not match the jewellery, ask the seller for clarification before purchasing. Do not rely solely on a screenshot or verbal claim from the seller; use the official verification facility.

For more information, visit the official BIS Care App page.

Why a Purchase Invoice Matters When Buying Gold Jewellery

A hallmark is important, but your purchase invoice is also essential. BIS consumer guidance states that the invoice for hallmarked jewellery should include details such as the article description, net weight of the precious metal, purity in carat and fineness, and hallmarking charges. An authentic invoice also provides useful documentation if you later need to raise a concern about the item.

Before completing your purchase, check that the invoice describes the jewellery accurately. For diamond jewellery, pay attention to the distinction between the net gold weight and any stones or other components included in the finished piece.

Keep the invoice and any accompanying certification documents safely. These records can be useful for future servicing, exchanges, insurance documentation, or resolving a dispute.

How to Check Hallmarks When Buying Diamond Jewellery

When purchasing diamond jewellery, gold purity and diamond details should be considered separately. The gold hallmark concerns the precious metal's purity; diamond certification provides information about the diamond itself.

For example, when exploring diamond rings, diamond earrings, or diamond necklaces, review the gold purity, metal specifications, and diamond documentation available for the selected piece.

For designs such as a diamond bracelet or a diamond mangalsutra, also consider the construction of the setting, clasp, and other components that affect comfort and practical wear.

At Araiya by Aza, the brand's jewellery combines IGI-certified lab-grown diamonds with BIS Hallmarked Gold. Reviewing the specifications of the individual product helps you understand the materials and certification associated with the particular design.

Gold Hallmarking vs Diamond Certification: What Is the Difference?

Gold hallmarking and diamond certification serve different purposes, so one should not be treated as a substitute for the other.

Gold hallmarking identifies the declared purity or fineness of the gold article through the BIS hallmarking system.

Diamond certification provides documented information about a diamond's assessed characteristics. For example, IGI certification relates to the diamond grading information stated in the relevant report.

When purchasing diamond jewellery, review both sets of information where applicable. A hallmark does not by itself establish the quality or grading of a diamond, and a diamond certificate does not verify the gold purity of the jewellery setting.

What Should You Do If a Hallmarked Item Appears Incorrect?

If you suspect that the hallmark is inconsistent, the HUID does not verify, or the stated gold purity may be incorrect, return to the seller and ask for clarification. Retain your invoice and the product information, and avoid making assumptions based only on the appearance of a small mark.

BIS guidance also explains that consumers can have jewellery tested through a BIS-recognised Assaying and Hallmarking Centre on a chargeable basis. Such testing can provide an additional route for checking the metal's purity when a concern remains unresolved.

Choose Gold Jewellery with Confidence

Understanding gold hallmarks helps you make a more informed jewellery purchase. By recognising the BIS mark, checking the purity and fineness, verifying the HUID, and retaining a detailed invoice, you can evaluate important information about a gold article before buying it.

Whether you are selecting a diamond engagement ring, a necklace for a special celebration, or a mangalsutra for everyday wear, take the time to review the metal specifications alongside the design and diamond details.

At Araiya by Aza, modern luxury brings together contemporary design, refined craftsmanship, IGI-certified lab-grown diamonds, and BIS Hallmarked Gold. A thoughtful buying decision begins with understanding what your jewellery is made of and choosing a piece that reflects your personal style.

Frequently Asked Questions

1. What does a BIS hallmark mean on gold jewellery?

A BIS hallmark indicates that the gold article has been marked under India's BIS hallmarking system to identify its declared purity or fineness. A modern HUID-based hallmark contains the BIS Standard Mark, purity and fineness mark, and HUID.

2. How can I check gold purity in India?

Look for the hallmark on the jewellery, check the purity marking, and verify the HUID using the official BIS Care app. You can also consult a BIS-recognised Assaying and Hallmarking Centre if further testing is needed.

3. What does 916 mean on gold jewellery?

The number 916 indicates gold fineness of 916 parts per thousand, or approximately 91.6% gold. It is commonly associated with 22-karat gold.

4. Is HUID compulsory on modern hallmarked gold jewellery?

HUID-based hallmarking is the current system for applicable hallmarked gold articles in India. The six-character alphanumeric code helps identify and trace an individual hallmarked article. Refer to BIS guidance for the applicable rules and any exemptions.

5. Does a gold hallmark certify the diamonds in jewellery?

No. A gold hallmark identifies the declared purity or fineness of the gold article; it does not certify the diamond's grading. Check the relevant diamond certification separately when purchasing diamond jewellery.