How to Check Gold Purity — Complete BIS Hallmark Guide
Complete guide on checking gold purity through BIS hallmark certification in India. Learn to read hallmark stamps.
Buying gold without verifying its purity can lead to significant financial losses. In India, the Bureau of Indian Standards (BIS) hallmarking system protects consumers. Here's everything you need to know about checking gold purity.
What is BIS Hallmarking?
BIS Hallmarking is a certification scheme that guarantees the purity of gold jewelry sold in India. Since June 16, 2021, hallmarking has been mandatory for gold jewelry sold by jewelers.
The New HUID System
In 2021, India introduced the Hallmark Unique ID (HUID) system — a 6-digit alphanumeric code stamped on every hallmarked gold piece. This replaced the older hallmark system and provides:
- Unique identification for each piece of jewelry
- Traceability from manufacturer to consumer
- Online verification through the BIS website or app
How to Read a Gold Hallmark
Every BIS-hallmarked gold piece has three marks:
1. BIS Standard Mark
A triangular symbol containing the BIS logo, confirming the piece has been tested and certified.
2. Purity/Fineness Grade
| Mark | Karat | Purity | Meaning |
|---|---|---|---|
| 999 | 24K | 99.9% | Pure gold |
| 958 | 23K | 95.8% | Very high purity |
| 916 | 22K | 91.6% | Standard jewelry gold |
| 875 | 21K | 87.5% | High purity jewelry |
| 750 | 18K | 75.0% | Durable everyday jewelry |
| 585 | 14K | 58.5% | Budget jewelry |
3. HUID Number
A unique 6-digit alphanumeric code that you can verify online.
How to Verify Gold Purity
Method 1: Check the HUID Online
- Visit bis.gov.in or download the BIS Care app
- Enter the HUID number stamped on your gold
- The system shows purity, jeweler details, and certification info
- Compare with what the jeweler told you
Method 2: Physical Inspection
- Look for clear hallmark stamps using a magnifying glass
- Check all three marks are present (BIS logo, purity, HUID)
- Stamps should be clean and not worn out
Method 3: Professional Testing
If you doubt the purity:
- Visit a BIS-recognized Assaying and Hallmarking Center
- They'll test using XRF or fire assay methods
- Cost: ₹200-500 per piece
- Results are definitive and legally valid
Method 4: Home Tests (Not 100% Reliable)
- Magnet test: Gold is not magnetic. If it sticks to a magnet, it's fake or heavily alloyed
- Ceramic test: Gold leaves a gold streak on unglazed ceramic; fake gold leaves a black streak
- Water test: Gold sinks immediately in water due to high density
- Acid test: Professional kits available, but use with caution
Red Flags When Buying Gold
Watch out for these warning signs:
- No hallmark: Refuse to buy unhallmarked gold jewelry
- Unusually low price: If it's significantly cheaper than market rate, question the purity
- No bill/receipt: Always get a detailed receipt with weight, purity, making charges, and HUID
- Reluctance to show hallmark: Reputable jewelers prominently display hallmarks
- "22K rates for 24K purity": No legitimate jeweler offers such a deal
- No buyback policy: Established jewelers always have clear buyback terms
Your Rights as a Gold Buyer
Under Indian consumer protection laws:
- You have the right to demand BIS hallmarked gold
- You can verify the HUID number on the BIS website
- You can file a complaint with BIS if hallmark is incorrect
- You're entitled to a detailed invoice showing weight, purity, rate, making charges, and GST
- You can get gold retested at any BIS-approved center
Hallmarked vs Non-Hallmarked: The Difference
| Feature | Hallmarked Gold | Non-Hallmarked Gold |
|---|---|---|
| Purity guarantee | ✅ Government certified | ❌ Relies on jeweler's claim |
| Resale value | ✅ Higher (verified purity) | ❌ May face discount |
| Legal protection | ✅ Consumer protection applies | ❌ Limited recourse |
| Price transparency | ✅ Clear purity-based pricing | ❌ Opaque |
| Required by law | ✅ Mandatory since 2021 | ❌ Cannot be sold legally |
Tips for Safe Gold Buying
- Always buy hallmarked gold — it's the law and your protection
- Verify HUID on the BIS website immediately after purchase
- Keep the invoice safe — it's your proof of purchase and purity
- Buy from reputed jewelers — BIS-registered jewelers are trustworthy
- Compare gold rates on GoldRatePro before visiting the jeweler
- Negotiate making charges — the gold rate is non-negotiable
- Check the weighing scale — it should be BIS-calibrated
Conclusion
BIS hallmarking is the most reliable way to verify gold purity in India. Always buy hallmarked gold, verify the HUID number, and keep your invoice. With these precautions, you can be confident that you're getting exactly the purity you're paying for.