How to Check Gold Purity and Avoid Fraud
India is the world’s second-largest consumer of gold, and unfortunately, gold fraud is a persistent problem. From impure jewellery sold as pure gold to fake gold bars, unsuspecting buyers lose crores every year. Knowing how to verify gold purity can save you from significant financial loss.
Understanding Gold Purity Standards in India
Gold purity in India is expressed in two ways:
- Karat system: 24K (99.9% pure), 22K (91.6% pure), 18K (75% pure), 14K (58.3% pure)
- Fineness system: 999 (24K), 916 (22K), 750 (18K), 585 (14K)
The fineness number tells you the gold content per 1,000 parts. So 916 fineness means 916 parts gold and 84 parts other metals per 1,000 parts total.
BIS Hallmarking: Your First Line of Defence
The Bureau of Indian Standards (BIS) hallmarking system is the most reliable way to verify gold purity in India. Since June 2021, hallmarking has been made mandatory for gold jewellery sold by registered jewellers.
A BIS hallmark consists of three marks:
- BIS logo: The standard BIS triangle mark, confirming the item has been tested by a BIS-certified laboratory.
- Purity grade: A number indicating the gold’s fineness (e.g., 916 for 22K, 750 for 18K).
- HUID (Hallmark Unique Identification): A 6-digit alphanumeric code unique to each piece of jewellery. This can be verified on the BIS website or the BIS Care app.
How to verify HUID: Download the BIS Care app or visit the BIS website. Enter the HUID code to see details about the jewellery, including the jeweller’s name, article type, purity, and the testing laboratory.
Methods to Check Gold Purity at Home
While professional testing is always recommended, here are some preliminary checks you can do:
1. Visual Inspection
Look for hallmark stamps on the jewellery. Check for the BIS logo, purity grade, and HUID. Use a magnifying glass if needed. If there is no hallmark, be cautious.
2. The Magnet Test
Gold is not magnetic. Hold a strong magnet near the gold item. If it is attracted to the magnet, it contains significant amounts of iron or other magnetic metals and is not pure gold. However, some non-magnetic metals can also be used to fake gold, so this test alone is not conclusive.
3. The Ceramic Test
Rub the gold item across an unglazed ceramic plate. Pure gold leaves a golden streak. Fake gold or heavily alloyed items leave a black or dark streak. Be careful as this can scratch the item.
4. The Density Test
Gold is one of the densest metals. You can check approximate density at home:
- Weigh the gold item precisely.
- Fill a graduated measuring cup with water and note the level.
- Drop the gold item in and note the new water level.
- Calculate density = weight / volume of water displaced.
- Pure 24K gold has a density of 19.3 g/cm3. 22K gold is about 17.7 g/cm3.
5. The Skin Test
Hold the gold against your skin for a few minutes. Pure gold does not react with skin. If you see green or black discoloration on your skin, the item likely contains a high percentage of copper or other base metals.
Professional Testing Methods
For accurate results, use professional testing:
XRF (X-Ray Fluorescence) Testing
This is the gold standard for non-destructive testing. An XRF machine shoots X-rays at the gold and analyses the reflected energy to determine exact composition. Most reputed jewellers and BIS-certified labs use this method. It gives results in seconds without damaging the item.
Fire Assay
This is the most accurate method but is destructive (a small sample is melted). It is used by BIS labs for hallmarking. The gold sample is melted with lead and other reagents to separate pure gold and determine its exact purity.
Touchstone Testing
A traditional method still used by many Indian jewellers. The gold item is rubbed on a dark touchstone, and the streak is treated with acid. The reaction indicates purity. While less precise than XRF or fire assay, experienced karigars can estimate purity with reasonable accuracy.
Common Gold Frauds in India and How to Avoid Them
1. Selling Lower Karat as Higher Karat
Some unscrupulous jewellers sell 18K gold as 22K, pocketing the difference. Protection: Always check for BIS hallmarking and verify the HUID.
2. Hollow or Filled Jewellery
Jewellery that looks heavy but is actually hollow or filled with a cheaper metal core. Protection: Weigh the jewellery and compare it to what you expect for its size. Ask for detailed weight breakup.
3. Stone Weight Included in Gold Weight
Some jewellers include the weight of stones (meena, kundan) in the total gold weight, charging you gold price for non-gold materials. Protection: Always ask for separate weight of gold and stones on the invoice.
4. Fake Gold Coins and Bars
Counterfeit gold coins that look genuine but contain tungsten or other metals with similar density. Protection: Buy only from reputed banks, authorised dealers, or government mints.
5. Digital Gold Scams
Fraudulent apps or websites claiming to sell digital gold but not actually backing it with physical gold. Protection: Use only well-known platforms regulated by proper authorities. Check if the gold is stored by reputed custodians like MMTC-PAMP or Augmont.
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