What Is BIS Hallmarking? India's Gold Authentication Guide

TL;DR

For most of Indian history, buying gold jewellery required trusting the jeweller's word on purity. Gold was tested at the point of sale, results varied by the tester's skill, and systematic fraud was both common and difficult to prove. BIS hallmarking changes this: it is a government-backed certification system that assigns every hallmarked piece a verifiable identity. Understanding how to read and verify a hallmark is now one of the most practical consumer skills an Indian jewellery buyer can have.

What Is BIS Hallmarking?

The Bureau of Indian Standards (BIS) is India's national standards body, established under the BIS Act of 1986. BIS Hallmarking for gold was introduced in 2000 and made mandatory in phases, becoming compulsory for all registered jewellers across India in June 2021. The system requires that gold jewellery sold by registered jewellers carry a hallmark certifying that the gold purity has been independently tested and verified by a BIS-recognised Assaying and Hallmarking (AH) centre.

The Three Components of a BIS Hallmark

A genuine BIS hallmark has exactly three marks stamped on the jewellery (visible under a 10x loupe):

1. BIS Logo

A triangle enclosing the letters BIS. This is the mark of the Bureau of Indian Standards and indicates the piece has been tested by a BIS-recognised centre.

2. Purity Mark (Fineness)

A three-digit number indicating the gold content:

• 999: 24-karat gold (99.9% pure). Very soft, rarely used in jewellery.
• 958: 23-karat gold (95.8% pure). Uncommon in Indian jewellery.
• 916: 22-karat gold (91.6% pure). The most common purity for Indian jewellery, especially for wedding and bridal pieces.
• 875: 21-karat gold (87.5% pure). Less common.
• 750: 18-karat gold (75% pure). Increasingly common for contemporary and daily-wear jewellery.
• 585: 14-karat gold (58.5% pure). Common for western-style fine jewellery.

3. HUID (Hallmarking Unique ID)

A six-character alphanumeric code (introduced from July 2021) that uniquely identifies each piece. The HUID is traceable: it links the specific piece to the jeweller who sold it, the assaying centre that tested it, and the test result. No two pieces have the same HUID.

How to Verify a BIS Hallmark

The HUID makes verification simple:

1. Download the BIS Care app (available on Android and iOS) or visit the BIS website.
2. Enter the six-character HUID printed on the piece.
3. The app returns the details: the gold purity, the jeweller's name and registration number, and the assaying centre that tested the piece.
4. If the HUID does not return a result, or the details do not match what the jeweller told you, the hallmark may be fake.

What BIS Hallmarking Does Not Cover

Important limitations to understand:

• It applies only to gold: silver, platinum, and fashion jewellery are not covered by mandatory BIS hallmarking for gold.
• It covers purity, not craftsmanship: a hallmarked piece is certified for gold content only. It says nothing about the quality of the making, the stones set in it, or the design.
• It does not apply to fashion jewellery: brass, plated, or non-gold jewellery does not require BIS hallmarking. Fashion jewellery labelled gold-plated is not gold and should not have a gold hallmark.
• Antique and heirloom pieces may not have HUID: pieces made before July 2021 may have older hallmark formats without a HUID. These may still be genuine.

Frequently Asked Questions

Is BIS hallmarking mandatory for all gold jewellery in India?

Since June 2021, BIS hallmarking is mandatory for all gold jewellery sold by registered jewellers in India, for purities of 14K, 18K, and 22K. Jewellers without BIS registration or those selling antique pieces may be exempt from specific provisions. Mandatory hallmarking applies to new jewellery sold at retail.

How do I check if a BIS hallmark is genuine?

Download the BIS Care app, enter the six-digit HUID stamped on the piece, and verify the details match. A genuine HUID will return the jeweller's registration details and the assaying centre's test results. A non-existent or mismatched HUID indicates a potentially fraudulent hallmark.

What is the difference between 916 and 750 gold?

916 gold is 22-karat (91.6% pure gold), the most common standard for Indian bridal and traditional jewellery. 750 gold is 18-karat (75% pure gold), commonly used for contemporary and daily-wear pieces. 22K is warmer and more yellow in colour; 18K is slightly paler and harder (more durable for daily wear because the higher alloy content makes it less soft than 22K).

Does fashion jewellery need BIS hallmarking?

No. BIS hallmarking for gold applies only to genuine gold jewellery. Fashion jewellery (brass, copper, zinc alloy) with gold plating does not require and should not carry a gold BIS hallmark. If a piece of obviously fashion jewellery claims a gold BIS hallmark, that is a red flag.

Conclusion

BIS hallmarking is one of the most consumer-friendly reforms in Indian jewellery retail. The HUID makes every hallmarked piece traceable and every hallmark verifiable in seconds. Use it every time you buy gold jewellery: check the three marks, verify the HUID, and buy with confidence. For non-gold jewellery purchases, knowing what BIS hallmarking does and does not cover helps you ask the right questions. Explore KANSYA's collection of handcrafted brass jewellery, where every piece states its material honestly.