How to Read and Understand Your BIS Hallmark Certificate

Every BIS-hallmarked gold or silver article carries a set of marks that certify its purity. Understanding what each mark means — and how to verify them — empowers consumers to confirm the authenticity and quality of their precious metal purchases with confidence.

The Three Marks of the BIS Hallmark

Since July 2021, the BIS hallmark consists of three components stamped on the article:

1. BIS Standard Mark — The triangular logo of the Bureau of Indian Standards. For gold articles, this mark certifies conformity to IS 1417 (the Indian Standard for gold jewellery). For silver articles, it certifies conformity to IS 2112:2025 and includes the word "SILVER."

This mark tells you that the article has been tested at a BIS-authorized laboratory and meets the relevant Indian Standard.

2. Purity/Fineness Number — A three-digit number indicating the proportion of pure precious metal per thousand parts. Common numbers include:

For silver, common numbers are 999 (fine silver), 925 (sterling silver), and 800.

3. HUID (Hallmark Unique Identification Number) — A six-character alphanumeric code unique to this specific article. No two articles share the same HUID. This code links the physical article to a digital record in the BIS database.

Where to Find the Hallmark

Hallmarks are typically stamped on less visible areas to preserve the article's appearance:

• Rings — inner band surface
• Bangles — inner surface near the clasp or edge
• Chains and necklaces — on the clasp or near the clasp junction
• Earrings — on the post or backing
• Pendants — on the back or the bail

Use a magnifying glass (10x loupe) for clear viewing. The marks should be sharp and well-defined. Blurred, incomplete, or irregularly shaped marks may warrant further verification.

Verifying the HUID Digitally

The most powerful verification step is digital. Use the BIS CARE App (free on Android and iOS) to verify any HUID:

1. Open the app and select "Verify Hallmark"
2. Enter the six-character HUID code or scan it
3. The app displays the article's tested purity, the hallmarking centre that tested it, the date of hallmarking, and the registered jeweller's details

If the HUID is valid, you have independent confirmation from BIS that the article has been tested and certified. If the HUID is not found in the database, the hallmark may be counterfeit — report it through the app.

Common Misunderstandings

"The hallmark guarantees the jewellery is 22K" — Not exactly. The hallmark certifies whatever purity is stamped. If the number reads 750, the article is 18K, not 22K. Always read the fineness number, not just the presence of a hallmark.

"All three marks must be present" — Correct. A valid BIS hallmark requires all three components: BIS logo, fineness number, and HUID. Articles with only one or two marks are not properly hallmarked.

"Old hallmarks with four marks are still valid" — As of 1 April 2023, articles with the old four-mark hallmark (without HUID) cannot be sold by registered jewellers. If you see an old-style hallmark on a new purchase, it should be verified.

"The hallmark proves the article is not counterfeit" — The physical hallmark can potentially be faked. The HUID digital verification is the definitive authenticity check. Always verify digitally.

What the Hallmark Does Not Cover

The BIS hallmark certifies purity — the proportion of precious metal in the alloy. It does not certify the weight of the article (you need a calibrated scale for that), the value of any gemstones, the quality of craftsmanship or making, or the overall market value.

For a complete picture, combine the hallmark purity certification with the detailed invoice from your jeweller.

Record Keeping

For every hallmarked article you own, maintain a record of the HUID number, the fineness grade, the purchase date and jeweller, and the invoice. This documentation is valuable for insurance, resale, inheritance, and any future verification needs.