Last updated: 13 June 2026 · 8 min read · By Rajesh Londe, 3rd generation jeweller and BIS certified valuer since 1989
Buying gold should feel like a celebration, not a gamble. The single tool that turns it from a leap of faith into a sure thing is the BIS hallmark. Since 1 April 2023 every gold piece sold in India must carry it, and reading it takes just two minutes once you know what to look for.
Londe Jewellers Gold & Diamonds, Nagpur's most trusted jeweller since 1989, has guided more than 5,00,000 Vidarbha families through this exact check across 37 plus years. This guide is your purity cluster. It covers reading the hallmark, understanding karat certification, and how to check gold purity online, so you walk into any showroom able to verify what you are paying for.
| Mark | Meaning | Where on the piece |
|---|---|---|
| BIS logo (triangle) | Confirms the piece is certified by the Bureau of Indian Standards. | Laser etched on the clasp, inner band or a flat surface. |
| Purity grade | The karat certification: 22K916 (91.6 percent), 18K750 (75 percent) or 24K999 (99.9 percent). | Next to the BIS triangle. |
| 6 digit HUID | The Hallmark Unique Identification, a code unique to that single piece. | A 6 character alphanumeric stamp near the other marks. |
| Jeweller mark | The BIS registration mark of the seller who hallmarked the piece. | Alongside the other three marks. |
If any one of the four marks is missing, the piece is not properly BIS hallmarked. All four together, verified on the app, is your complete proof of purity.
Hold the piece under good light, or use a small loupe if you have one. On a ring look inside the band, on a chain or bangle look near the clasp, and on a pendant look on a flat back surface. You are searching for four tiny laser etched marks grouped together. The BIS triangle is the anchor. Beside it sits the purity grade, then the 6 digit HUID, then the jeweller mark. Spend ten seconds confirming all four are present before you go further. This first read alone filters out unhallmarked gold instantly.
The purity grade is the heart of the hallmark, because it is your certified guarantee of how much pure gold you are buying. Indian gold jewellery uses three common grades.
This three digit number is not the jeweller's word, it is an independent karat certification assigned by a BIS assaying and hallmarking centre. It is exactly what links the rate you pay to the gold you receive. For how that rate itself is set, see how the daily gold rate in Nagpur is decided.
The marks tell you the piece claims to be certified. The final step proves it. The official way to check gold purity online is the free BIS CARE app from the Bureau of Indian Standards, available on the Google Play Store and the Apple App Store. The check takes under a minute.
The one result that should stop a purchase is Record Not Found. A counterfeit triangle can be stamped onto cheaper metal, but the unique HUID cannot be faked in the national database. That is why the online check is the safeguard, and why it is worth the extra minute every single time.
Read the four marks. Confirm the karat certification in the purity grade. Verify the HUID online on the BIS CARE app. Those three habits, done in two minutes at the counter, mean you never again have to take a purity claim on trust. They work in any showroom, on any piece, anywhere in India. For the deeper version of step three, including screenshots of the app flow and what to do if a piece fails, read our full BIS hallmark and HUID verification guide.
Walk into the Londe Jewellers Gold & Diamonds Sitabuldi flagship at Modi Number 2, opposite Datta Mandir, Sitabuldi, Nagpur 440012 and our team will hand you a loupe, point out all four marks on the piece you like, and verify the 6 digit HUID on the BIS CARE app at the counter while you watch. Open 11:00 AM to 8:30 PM, seven days a week. Every gold piece we sell is BIS hallmarked with a unique HUID, and the certified purity is printed on your invoice. Call +91 90755 12053.
Also at Gokulpeth, Manish Nagar and Nandanvan. Golden Bonds of Trust since 1989.
Q: What are the 4 marks on BIS hallmarked gold?
Every piece carries four marks: the BIS triangle logo confirming certification, the purity grade such as 22K916 or 18K750, a 6 digit alphanumeric HUID unique to that piece, and the jeweller mark of the seller. If any one is missing, the piece is not properly hallmarked.
Q: How do I check a BIS hallmark in 2 minutes?
Find the four marks under good light, read the purity grade to confirm the karat, then download the free BIS CARE app, tap Verify HUID, and enter the 6 digit HUID. If the jeweller name, weight and purity match your invoice, it is genuine. The whole check takes about two minutes.
Q: What does the karat certification number on gold mean?
The purity grade beside the BIS triangle is the karat certification. 22K916 is 91.6 percent pure, 18K750 is 75 percent pure, and 24K999 is 99.9 percent pure. This three digit number is your independently certified guarantee of how much pure gold is in the piece.
Q: How can I check gold purity online?
Use the official BIS CARE app from the Bureau of Indian Standards, free on the Google Play Store and Apple App Store. Tap Verify HUID and enter the 6 digit HUID. The app returns the jeweller name, item, weight and certified purity from the BIS database. If it shows Record Not Found, the hallmark is fake.
Q: Is all gold at Londe Jewellers BIS hallmarked?
Yes. Every gold piece across our four Nagpur showrooms is BIS hallmarked with the full 4 part mark and a unique 6 digit HUID. We show you the karat certification, let you verify the HUID at the counter, and print the purity on your invoice. We have done this for 5,00,000 Vidarbha families since 1989.
Visit any of our 4 Nagpur showrooms. We show all four marks, verify the HUID on the BIS CARE app at the counter, and print the certified purity on your invoice. All gold BIS hallmarked. All diamonds IGI or GIA certified natural. 0 percent deduction on old gold exchange. 7 day money back guarantee.
Open 11:00 AM to 8:30 PM · All 4 stores · 7 days a week · Golden Bonds of Trust since 1989
Last updated: 13 June 2026 · Based on Bureau of Indian Standards hallmarking rules effective 1 April 2023 · Rajesh Londe, 3rd generation jeweller and BIS certified valuer, Londe Jewellers Gold & Diamonds
