How to Check Gold Purity and BIS Hallmark Before You Buy

You picked a chain that looked perfect under the showroom lights — then a friend asked if you checked the BIS hallmark. That question stops many first-time buyers cold, because how to check gold purity is not taught in school, yet it protects every rupee you spend.

Hallmark gold carries a fineness stamp (916 or 999) and a traceable HUID on your bill. By the end of this guide, you will verify purity in minutes and spot red flags before you pay.

Key Takeaways

• BIS hallmark is mandatory on new gold jewellery since June 2021.
• 916 means 22K; 999 means 24K — match stamp to bill.
• HUID on the invoice links to your exact piece.
• No hallmark on new jewellery is a red flag.
• Assaying centres test older unmarked family gold.

What is BIS hallmark gold?

The Bureau of Indian Standards (BIS) certifies that a piece meets declared gold purity. A valid hallmark set includes:

• BIS logo — certification mark
• Fineness — 916 for 22K, 750 for 18K, 999 for 24K
• Assaying centre mark — which lab tested the lot
• Jeweller's identification mark — registered seller code

Hallmarking on new jewellery has been compulsory since June 2021. If a store sells fresh stock without it, walk away.

Understanding fineness and karat numbers

When you see 916 inside a ring, you are holding 22K hallmark gold — the standard for bridal and daily wear. Learn how 22K compares to 24K in our 22K vs 24K guide.

How to verify hallmark gold before you pay

1. Inspect the stamp — inner band of rings, clasp of chains, back of pendants. Use a magnifying glass.
2. Match fineness to the label — 916 on metal means 22K on the tag.
3. Check HUID on the invoice — six-digit ID tied to your piece on the BIS trace portal.
4. Weigh at purchase — confirm bill weight matches the scale reading in the shop.
5. Keep documents — GST invoice, HUID, and payment proof for resale.

Pro Tip: Photograph the stamp and scale reading before you leave the store. It takes 30 seconds and helps at buyback or insurance claims.

Red flags that should stop the purchase

• No BIS hallmark on brand-new jewellery
• Price far below today's gold price in Chennai or your city rate for stated purity
• Reluctance to give itemised invoice with weight, rate, and HUID
• Scratch-out or blurry stamps that look tampered

If a 10 g chain is priced like 8 g of gold at market rate, purity — not design — is usually the hidden cut.

What if your gold has no hallmark?

Family heirlooms may predate mandatory hallmarking. You can:

1. Submit the piece to a BIS-recognised assaying centre for melting or non-destructive testing.
2. Ask a reputed jeweller for buyback testing — insist on written purity results.
3. Avoid DIY acid kits — inaccurate tests damage trust and metal.

How purity ties to price

Pure 22K should track the day's gold rate plus making charges. A ₹500/g discount with no hallmark is rarely a bargain — it is often under-karat metal.

Frequently Asked Questions

Can jewellers fake hallmark stamps?

Counterfeit stamps exist. Use HUID tracing and buy from registered sellers. Extreme discounts remain the biggest warning sign.

Do coins need hallmark?

Yes. Investment coins and bars should carry BIS marks and fineness 999 or 916 as applicable.

Is 18K gold hallmarked?

Yes — look for 750 fineness. It is valid for fashion jewellery but resale value per gram is lower than 22K.

Does hallmark guarantee resale price?

It guarantees purity, not design value. Buyback still depends on weight and the day's MCX-linked rate.

Where to check live rates after verifying purity?

Use gold price per gram on GoldSilverPrice.in before you negotiate.

Verify first, pay second

Checking gold purity takes minutes; fixing a bad purchase takes years. Stamp, HUID, invoice, and weight should all agree before you swipe your card.

Next time you shop, open today's gold price today and bring this checklist. Bookmark the page — informed buyers rarely overpay for the wrong karat.