How to Check Gold Coin Purity Using Hallmarks

Learn how to read BIS hallmark symbols to verify gold coin purity, avoid fraud, and buy gold coins with full confidence.

Why Hallmarking Matters When Buying Gold Coins

With gold prices rising, verifying purity before you buy is more important than ever. The BIS (Bureau of Indian Standards) hallmark is the official mark of quality assurance in India, and knowing how to read it can protect you from overpaying for underpure gold.

What Is a BIS Hallmark

A BIS hallmark is a government-regulated certification stamped or engraved on gold items, confirming that the gold has been tested and meets a declared purity standard. Since mandatory hallmarking rules apply widely across India, most authorised sellers today are required to hallmark their gold coins.

Symbols to Look For on a Gold Coin

BIS Logo - the triangular BIS mark confirming certification
Purity Grade - shown as 999 for 24K or 916 for 22K gold
HUID Number - a unique 6-digit alphanumeric code specific to that piece
Assaying Centre Mark - identifies the BIS-recognised lab that tested the item

How to Verify a Hallmark

Most hallmarked gold today carries a HUID number, which can be checked through the BIS Care app by entering the code. This will show details like purity, hallmarking date, and the assaying centre, helping you confirm the coin is genuinely certified and not just carrying a printed symbol.

Common Signs of Fake or Misleading Hallmarks

Blurry, uneven, or inconsistent stamping
No HUID number or a number that doesn't verify on the BIS app
Seller unwilling to provide a purity certificate alongside the coin
Price significantly lower than the day's market gold rate

Other Ways to Cross-Check Purity

Besides the hallmark, reputed sellers use karat meters or XRF testing machines in-store to verify purity on request. If you're buying a high-value coin, it's reasonable to ask the seller to test it in front of you before completing the purchase.

Things to Consider

Never rely only on a visual stamp - verify the HUID digitally when possible
Always collect the purity certificate and invoice together
Buy only from BIS-registered jewellers or certified sellers
Compare the coin's price against the current gold rate to spot red flags early

Frequently Asked Questions

Here are common questions about verifying gold coin purity through hallmarks.

Explore More with FinVedik GoldBiz

Before you verify purity, it helps to know today's fair market price. Visit our Gold Rates page for live updates so you can buy with full confidence.