Indian BIS Hallmark — What This Hallmark Means

When you see a BIS hallmark on gold jewelry, it means the piece has been tested and certified by a Bureau of Indian Standards-recognized assay and hallmarking center. India made BIS hallmarking mandatory for gold jewelry sold by registered jewelers starting in June 2021, making it one of the most significant consumer protection developments in the global gold market. The hallmark guarantees that the gold content matches what the seller claims, protecting buyers from underkarating — a historically persistent problem in the Indian gold trade.

The current BIS hallmark consists of three marks applied together. First is the BIS logo, a distinctive triangular symbol that certifies conformity to Indian standards. Second is the purity grade, expressed as a fineness number: 999 for 24K, 916 for 22K, 750 for 18K, or 585 for 14K. Third is a six-digit alphanumeric HUID (Hallmark Unique Identification) number that uniquely identifies each individual piece of jewelry and can be verified online through the BIS Care app or website.

The HUID system, introduced in July 2021 to replace the earlier four-mark system, represents a significant technological advance in hallmarking. Each HUID is linked to a digital record containing the jeweler's identity, the assay center that tested the piece, the date of hallmarking, and the exact purity finding. This traceability makes the Indian system one of the most transparent hallmarking frameworks in the world and provides consumers with an unprecedented level of verifiable information about their jewelry.

On rings, the BIS hallmark is stamped on the inside of the band. On necklaces and chains, look on the clasp or on a tag near the closure. On bangles, the marks are typically on the inner surface. On earrings, check the posts or backs. The hallmark is applied using laser marking technology in most modern assay centers, producing small but crisp and legible marks.

The three-part hallmark (BIS logo, purity grade, and HUID number) is typically arranged in a line. The HUID is a six-character alphanumeric code that can be verified online. If you cannot read the HUID with the naked eye, a jeweler's loupe at 10x magnification will make it legible. Some larger pieces may have the marks applied more prominently.

The most common purity grades seen on BIS-hallmarked jewelry are 916 (22K gold, the dominant standard for Indian jewelry), 750 (18K gold, common in diamond-set pieces), and 585 (14K gold, increasingly popular for everyday wear). The 999 (24K) mark is found primarily on gold coins and bars rather than wearable jewelry due to pure gold's softness.

Before July 2021, BIS hallmarks used a four-mark system that included the BIS logo, purity grade, assay center's identification mark, and the jeweler's identification mark. Pieces hallmarked under this older system remain valid but lack the HUID traceability. You may encounter both systems in the market, with older-format marks on pieces manufactured or hallmarked before the transition.

A common misconception is that BIS hallmarking guarantees the quality of craftsmanship or the value of gemstones in the piece. The BIS hallmark certifies only the gold purity — it says nothing about the quality of workmanship, the authenticity of gemstones, or the overall design value. Another widespread misunderstanding is that all gold jewelry sold in India must be hallmarked. While the mandate covers registered jewelers in notified districts, exemptions exist for certain categories including export jewelry and very small pieces below specified weight thresholds.

Some consumers also mistakenly believe that a BIS hallmark means the jewelry was manufactured by BIS. In reality, BIS does not manufacture anything. It sets standards and accredits independent assay and hallmarking centers that perform the actual testing and marking. The jeweler submits finished pieces to an accredited center, where they are tested, marked if they pass, and returned.

If you have a piece with a BIS hallmark, you can verify its authenticity by checking the HUID number on the BIS Care mobile app or the BIS website (bis.gov.in). Enter the six-digit HUID to retrieve the complete hallmarking record, including the purity, the assay center, and the jeweler's details. This verification is free and takes only a few seconds.

If you are purchasing gold jewelry in India, always insist on BIS-hallmarked pieces and verify the HUID before completing the purchase. If a jeweler claims a piece is hallmarked but the HUID verification fails or returns no result, do not proceed with the purchase. For older pieces without HUID (pre-July 2021), you can have them independently tested at any BIS-recognized assay center to confirm purity.