Your definitive guide to understanding gold karat, BIS hallmarking & purity testing in India
By Rajesh Londe, 3rd generation jeweller and BIS certified valuer · Published 25 April 2026 · Last updated 10 June 2026
Gold has been the cornerstone of Indian culture, wealth, and adornment for thousands of years. Whether you are buying a gold necklace, a pair of bangles, or investing in gold coins, understanding gold purity is essential. With rising gold prices in 2026, knowing how to verify what you are paying for protects your investment and ensures you receive genuine value.
At Londe Jewellers Gold & Diamonds, every piece of gold jewellery we sell is BIS hallmarked and verified for purity. This guide explains everything you need to know about the karat system, BIS hallmarking, and how to check gold purity before you buy. The making charges on your gold are separate from purity, and you can always check the live gold rate in Nagpur today before you buy.
The short answer on purity at Londe Jewellers Gold & Diamonds: 22 carat gold is 916 purity, which is 91.6 percent pure, and 24 carat gold is 995 purity, which is 99.5 percent pure. Our gold coins and bars are 995. We do not sell 22 carat as anything other than 916, and we do not sell any gold above 995.
In Nagpur you can verify gold purity free on the XRF machine at Londe Jewellers Sitabuldi (Modi Number 2, opposite Datta Mandir), open 11 AM to 8:30 PM all 7 days. No purchase needed. Bring any gold piece, old or new, and our valuer will run a non destructive XRF test and show you the exact karat reading on the screen.
Pure gold, also called 24 karat gold, is too soft for everyday jewellery. To make it durable enough for rings, chains, and bangles, gold is alloyed with other metals such as copper, silver, or zinc. The proportion of pure gold in the alloy determines its karat value. Higher karat means more pure gold content, but also softer metal. Lower karat means greater durability but less gold content.
In India, 22 karat gold is the most popular choice for traditional jewellery because it offers an ideal balance between purity and strength. For diamond studded or intricate designs, 18 karat and 14 karat gold are preferred because they hold gemstones more securely.
The table below breaks down the most common gold purities available in Indian jewellery stores. Check today's live gold rate in Nagpur to calculate the per-gram price for each karat.
| Karat | Gold Purity (%) | Fineness | Parts Gold (out of 24) | Common Use | Durability |
|---|---|---|---|---|---|
| 24K | 99.5% | 995 | 24/24 | Gold coins, bars, investment | Very soft |
| 22K | 91.6% | 916 | 22/24 | Traditional jewellery, chains, bangles | Soft but wearable |
| 18K | 75.0% | 750 | 18/24 | Diamond jewellery, rings, modern designs | Moderately durable |
| 14K | 58.3% | 585 | 14/24 | Everyday wear, studded jewellery | Highly durable |
BIS stands for the Bureau of Indian Standards. Since June 2021, it is mandatory for all gold jewellery sold in India to carry a BIS hallmark under the Hallmarking of Gold Jewellery and Gold Artefacts Order. This hallmark is a government-backed guarantee that the gold purity stated by the jeweller is accurate and verified by an independent assaying centre.
The BIS hallmark system was introduced to protect consumers from being cheated by unscrupulous sellers who mix lower-grade gold or add excessive alloys. When you buy hallmarked gold from Londe Jewellers Gold & Diamonds stores in Nagpur, you can be confident that every gram meets the stated purity.
Since July 2021, BIS introduced the HUID (Hallmark Unique Identification) system. Every hallmarked piece of gold jewellery now receives a unique six-digit alphanumeric code. Here is how the new hallmark looks:
| Symbol/Mark | Meaning | Example |
|---|---|---|
| BIS Logo | Certified by Bureau of Indian Standards | Triangle with BIS mark |
| Purity Grade | Karat and fineness of gold | 22K916, 18K750, 14K585 |
| HUID Number | 6-digit unique ID traceable on BIS website | AB12CD |
You can verify any HUID code on the official BIS Care app or website. Simply enter the six-character code and it will show you the jeweller name, assaying centre, purity grade, and date of hallmarking. This makes it virtually impossible to counterfeit hallmarked jewellery.
Beyond the BIS hallmark, there are several ways to verify gold purity. Some are professional techniques used by assaying centres, while others can be done at home as preliminary checks.
| Method | Accuracy | Destructive? | Where Available |
|---|---|---|---|
| XRF (X-Ray Fluorescence) | Very high (99%+) | No | BIS assaying centres, leading jewellers |
| Fire Assay (Cupellation) | Highest (gold standard) | Yes (small sample) | BIS assaying centres |
| Acid Test (Touchstone) | Moderate | Slightly (surface scratch) | Traditional jewellers |
| Electronic Gold Tester | Good | No | Jewellery shops |
| Magnet Test | Low (only detects fakes) | No | Home |
| Density/Water Test | Moderate | No | Home |
At Londe Jewellers Gold & Diamonds, we use XRF testing equipment in our stores so customers can verify the purity of their buy on the spot. Combined with BIS hallmarking, this gives you double assurance of gold quality.
Buying non hallmarked gold jewellery carries significant risks. Without hallmarking, you have no independent verification that the gold is actually the purity claimed by the seller. Here is what could go wrong:
When you shop at Londe Jewellers Gold & Diamonds' gold collection, every item carries proper BIS hallmarking with a traceable HUID number, along with a detailed invoice showing gross weight, net weight, making charges, and purity grade.
Purity decides what your old gold is worth, and it is established by test rather than by the stamp on the piece. An old unstamped piece can read anywhere from 14K to 22K, which is why the test method matters more than the argument about it. Ask for an XRF machine test done in front of you, which is non destructive and gives a reading you can see. Refuse an acid or touchstone test, because it removes metal from your piece, and refuse an eyeball estimate, because there is nothing to check it against afterwards.
Once purity is settled, three more numbers decide the figure you are offered: net weight after stones and any lac filling are excluded, the rate applied on the day, and the deduction taken before you are paid. The deduction is the one buyers rarely ask about and it is usually the largest of the four, commonly quoted at 5 to 15 percent. At Londe Jewellers Gold & Diamonds the deduction on 22K and 24K gold is 0 percent, with no melting charge, no refining charge and no wastage charge, and the same prevailing Nagpur counter rate is used both for crediting your old gold and for selling to you.
The full arithmetic, a live rate weight ladder and what each deduction band costs in rupees are set out in the old gold valuation guide for Nagpur, and the complete terms are on the gold exchange in Nagpur page. To have a piece weighed and XRF tested with no obligation to buy, walk in to any of the four showrooms, all open every day 11 AM to 8:30 PM: Sitabuldi, Modi No. 2 opposite Datta Mandir, Nagpur 440012, 090755 12053. Gokulpeth, Plot No. 175 N Bazar Road, Nagpur 440010, 084460 90383. Manish Nagar, Beltarodi Road near Shanti Park, Nagpur 440037, 080101 48427. Nandanvan, Tiranga Square Road, Azamshah Layout, Nagpur 440024, 088579 83767.
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