How to Check Gold Purity: Understanding BIS Hallmark and HUID in India

Gold jewellery is not only a symbol of beauty and tradition in India but also an important financial investment. When buying gold jewellery, ensuring its purity and authenticity is essential. To protect consumers and maintain quality standards, the Bureau of Indian Standards (BIS) introduced the BIS Hallmarking system, which verifies the purity of gold jewellery. Along with this, the HUID (Hallmark Unique Identification) system was introduced to make gold authentication more transparent and traceable.

This guide explains how to check gold purity and understand BIS Hallmark and HUID in India before purchasing gold jewellery.

What is Gold Purity?

Gold purity refers to the amount of pure gold present in a jewellery item. It is measured in karats (K). The higher the karat value, the higher the purity of gold.

Common gold purity levels in India include:

• 24K Gold (999) – 99.9% pure gold, usually used for coins and bars.

• 22K Gold (916) – 91.6% pure gold, commonly used for jewellery.

• 18K Gold (750) – 75% pure gold, often used in diamond jewellery.

• 14K Gold (585) – 58.5% pure gold, used in modern lightweight jewellery.

Since pure gold is very soft, it is often mixed with other metals like copper or silver to make durable jewellery.

What is BIS Hallmark?

The BIS Hallmark is an official certification mark issued by the Bureau of Indian Standards (BIS) that confirms the purity of gold jewellery. BIS hallmarking ensures that the gold jewellery you buy meets the purity standards set by the government of India.

A BIS hallmarked gold jewellery piece includes the following marks:

1. BIS Logo – Indicates that the jewellery is certified by BIS.

2. Purity/Fineness Mark – Shows the purity level, such as 22K916, 18K750, or 14K585.

3. HUID Code – A unique 6-digit alphanumeric code for each jewellery item.

4. Jeweller’s Identification Mark (Optional) – Indicates the registered jeweller who sold the product.

These marks help ensure transparency and authenticity in gold purchases.

What is HUID (Hallmark Unique Identification)?

HUID stands for Hallmark Unique Identification, a unique alphanumeric code assigned to every piece of BIS hallmarked jewellery.

This system was introduced to make the hallmarking process more reliable and traceable. Each jewellery item receives its own HUID code, which helps track the jewellery through the hallmarking database.

Benefits of HUID include:

• Better transparency in gold purchases.

• Easy traceability of hallmarked jewellery.

• Protection against fraud or fake hallmarking.

• Greater consumer confidence.

Consumers can verify the authenticity of gold jewellery by checking the HUID code through official BIS verification methods.

How to Check Gold Purity Before Buying

Before purchasing gold jewellery, follow these important steps to verify its purity:

1. Look for the BIS Hallmark
Always check whether the jewellery has the BIS hallmark symbol along with the purity marking.

2. Check the Purity Number
Ensure the jewellery displays the correct purity code such as 916 for 22K gold or 750 for 18K gold.

3. Verify the HUID Code
Each BIS hallmarked jewellery piece must have a unique HUID code engraved.

4. Buy from a Trusted Jeweller
Always purchase gold jewellery from a BIS registered and reputable jewellery store.

5. Request Gold Purity Testing
Many jewellers provide gold purity testing using advanced machines like Karatmeters (XRF technology) that measure gold purity without damaging the jewellery.

Why BIS Hallmark Jewellery Is Important

Buying BIS hallmarked gold jewellery offers several advantages:

• Guarantees gold purity and authenticity.

• Protects customers from fraud.

• Ensures fair pricing based on purity.

• Builds trust between jewellers and customers.

• Helps maintain quality standards in the jewellery industry.

Because of these benefits, the Government of India has made BIS hallmarking mandatory for gold jewellery in many regions.

Conclusion

Checking gold purity is one of the most important steps when buying gold jewellery. Understanding BIS Hallmark and HUID helps consumers ensure they are purchasing genuine and certified gold. Always look for the BIS hallmark symbol, purity marking, and HUID code before making a purchase.

Buying from a trusted jewellery store and verifying gold purity through proper testing methods ensures transparency, authenticity, and peace of mind.

If you are planning to buy certified gold jewellery, always choose a BIS registered jeweller who provides hallmark-certified products and accurate purity testing.