Complete Guide on How to Check Gold Purity Before Buying Jewellery

Quick Overview

• Knowing how to check gold purity helps you make informed jewellery purchases and avoid overpaying.
• Always look for a BIS hallmark and verify the HUID number before purchasing gold jewellery.
• Understand common purity markings like 916, 750, 585, and 333 to identify the actual gold content.
• Home-based gold purity tests can provide basic indications, but cannot accurately confirm karat value.
• Professional methods like XRF testing and karat meters offer the most reliable gold quality check.
• Compare 18K, 22K, and 24K gold to choose the right purity for jewellery, investment, or everyday wear.

Summary

Before buying gold jewellery, always verify the BIS hallmark and HUID, understand purity markings such as 916 and 750, ask the jeweller for certification, and compare the weight with the invoice. While simple home-based gold purity tests like magnet or water tests may provide limited clues, they cannot accurately determine purity. Professional testing methods like XRF analysis and karat meters provide the most reliable results. Following these steps helps you purchase genuine gold with confidence.

Introduction

Gold has always been one of India's most trusted investments and a popular choice for jewellery. Whether you're buying a wedding necklace, investment coins, or everyday ornaments, one question matters more than anything else: Is the gold really as pure as the seller claims?

Learning how to check gold purity protects you from paying premium prices for lower-quality gold. It also ensures better resale value, accurate pricing, and peace of mind.

In this guide, we'll explain different gold purity check methods, decode hallmark numbers, discuss professional testing techniques, and help you identify genuine gold before making a purchase.

Gold Purity Check Before You Buy

Buying gold is not simply about choosing an attractive design. Purity determines both the jewellery's value and its long-term worth.

Purity, Karat and Percentage

Gold purity is measured in karats (K), where:

The higher the karat, the greater the proportion of pure gold in the jewellery.

Why Purity Affects Price and Resale

Pure gold commands a higher market price. Jewellery made with higher purity generally has:

• Better resale value
• Higher exchange value
• Greater investment potential
• More accurate valuation for loans

Lower purity jewellery costs less but also contains more alloy metals.

Why Appearance Alone Is Unreliable

Many buyers assume bright yellow jewellery indicates higher purity. This isn't true. Modern jewellery polishing techniques can make lower-karat gold appear similar to 22K or 24K jewellery. Likewise, antique-finish jewellery may appear dull despite being highly pure. Visual inspection alone is never enough for a reliable gold quality check.

Also read: How Gold Loan Works in India

Start With Hallmark and Number Codes

One of the easiest ways to perform a gold purity check is by understanding hallmark markings.

What 916, 750, 585 and 333 Mean

These numbers indicate the percentage of pure gold.

Understanding these codes helps buyers immediately identify the purity level.

HUID and Hallmark Details to Verify

BIS-hallmarked jewellery carries a Hallmark Unique Identification (HUID). Check that the jewellery includes:

• BIS logo
• Purity mark (916, 750, etc.)
• Six-digit alphanumeric HUID
• Jeweller's identification mark

You can verify the HUID through the BIS Care mobile application.

Signs a Hallmark Needs Closer Scrutiny

Be cautious if:

• The hallmark looks uneven or blurred.
• Different parts of the jewellery have different markings.
• The jeweller cannot explain the hallmark.
• No invoice mentions purity.

These may indicate counterfeit or altered jewellery.

How to Check Gold Purity at a Shop

Purchasing from a trusted jeweller doesn't mean you should skip verification.

Questions to Ask the Jeweller

Before buying, ask:

• What is the gold purity?
• Is the jewellery BIS hallmarked?
• Can you explain the HUID?
• What are the making charges?
• What is the buyback policy?
• Is there a purity certificate?

A reputable jeweller will answer these questions transparently.

Certificate, Bill and Weight Checks

Always verify:

• The weight shown on the jewellery
• The weight is mentioned on the invoice
• Purity is mentioned in the bill
• Hallmark details
• Making charges
• GST

Never accept handwritten bills without detailed information.

When to Request Machine Testing

If purchasing high-value jewellery or investment pieces, ask whether the store offers machine-based purity testing. Many reputed jewellers now provide XRF-based testing within minutes.

Gold Purity Test Methods at Home

Several home methods are commonly discussed online. However, they should only be treated as preliminary checks.

Magnet Test

Pure gold is not magnetic. If jewellery strongly sticks to a magnet, it likely contains iron or other magnetic metals. However:

• Clasps may contain magnetic components.
• Some alloys behave differently.

This test cannot confirm purity.

Water Test Limitations

Gold is dense and sinks quickly in water. However:

• Many fake metals also sink.
• Density alone cannot identify the karat value.

This test is unreliable as a standalone gold purity test.

Ceramic Scratch Test Risks

Some people rub jewellery against an unglazed ceramic tile.

• Gold typically leaves a golden streak.
• Fake jewellery may leave black marks.

Unfortunately, this method can permanently scratch jewellery and reduce its finish. Avoid using it on expensive ornaments.

Why Home Tests Cannot Confirm Karat

Home methods may identify obvious fake jewellery, but cannot determine whether gold is 18K, 22K, or 24K. Only professional testing equipment can accurately measure gold content.

Professional Gold Quality Check Options

Professional evaluation provides the highest confidence when verifying purity.

Karat Meter and XRF Testing

X-ray fluorescence (XRF) machines analyse metal composition without damaging jewellery. Benefits include:

• Fast results
• Non-destructive testing
• Accurate purity percentage
• Suitable for finished jewellery

Many modern jewellery stores now offer this service.

Acid Testing and Touchstone Methods

Traditional jewellers often use acid testing. The process involves:

• Rubbing gold on a touchstone
• Applying testing acid
• Observing chemical reactions

While fairly accurate, minor surface wear may occur.

Best Method for Finished Jewellery

For expensive jewellery, XRF testing remains the safest and most accurate gold quality check because it causes no damage and delivers detailed purity analysis.

18K, 22K and 24K Comparison

Choosing the right purity depends on your purpose.

Which Purity Suits Daily Wear

18K gold is more durable because it contains a higher proportion of alloy metals. It is commonly used for:

• Diamond jewellery
• Office wear
• Rings
• Bracelets
• Designer collections

Which Purity Suits Investment Buying

22K and 24K gold are preferred for:

• Investment
• Gold coins
• Wedding jewellery
• Long-term value preservation

Why 24K Is Rare in Jewellery

Although 24K gold is the purest, it is extremely soft. It scratches, bends, and deforms easily, making it unsuitable for most jewellery designs.

Also read: Difference Between 22K and 24K Gold

Common Mistakes During a Gold Purity Check

Many buyers unknowingly make avoidable mistakes.

Trusting Stamp Numbers Without Context

A stamped number alone does not guarantee authenticity. Always confirm:

• BIS hallmark
• HUID
• Invoice
• Seller credibility

Confusing Polish With Purity

Highly polished jewellery often appears richer in colour, but polishing affects appearance, not gold content. Never judge purity based solely on shine.

Ignoring Making Charges and Return Terms

A lower jewellery price may hide:

• High making charges
• Poor buyback rates
• Lower purity
• Restrictive exchange policies

Always compare the total purchase cost rather than the gold price alone.

Gold Buying Checklist

Before making payment, complete a final verification.

Checks to Finish Before Payment

•  Verify the BIS hallmark
• Check HUID number
• Match invoice purity
• Confirm jewellery weight
• Ask for a purity certificate
• Understand the exchange policy
• Review making charges
• Verify GST calculation

Red Flags to Walk Away From

Avoid purchasing if:

• Jewellery lacks a hallmark.
• Seller refuses testing.
• Purity certificate is unavailable.
• The invoice omits purity details.
• Hallmark appears altered.
• Prices seem unusually low compared to market rates.

Conclusion

Knowing how to check gold purity is one of the smartest steps you can take before investing in jewellery. By understanding hallmark numbers, verifying HUID details, asking the right questions, and relying on professional gold purity tests when necessary, you can confidently purchase genuine gold that offers lasting value. Whether you're buying jewellery for daily wear, weddings, or investment, taking a few extra minutes to perform a proper gold purity check can save you from costly mistakes.

If you're planning to unlock the value of your gold without selling it, explore the L&T Finance PLANET App, where you can conveniently access gold loan services and manage your financial needs through a seamless digital experience.

Frequently Asked Questions

1. Is 916 hallmark 22K or 24K?

A 916 hallmark represents 22K gold, meaning the jewellery contains 91.6% pure gold and 8.4% other metals for added strength.

2. What purity is 333 gold?

333 gold contains 33.3% pure gold, equivalent to approximately 8K gold. It is less common in India and is primarily found in certain international markets.

3. What is 75% gold purity?

Gold with 75% purity is known as 18K gold and is identified by the 750 hallmark. It is widely used for gemstone and diamond jewellery due to its durability.

4. How to check if gold is 22K or 24K?

Check the hallmark on the jewellery. A 916 mark indicates 22K gold, while 999 or 995 indicates 24K gold. For complete accuracy, request XRF or karat meter testing from a trusted jeweller.

5. How to check 916 hallmark gold?

Look for the BIS hallmark, the 916 purity mark, and the HUID number on the jewellery. Verify the HUID using the BIS Care app and ensure the invoice matches the jewellery's purity details.

6. Which is better, 22K or 18K gold?

It depends on your purpose. 22K gold is better for traditional jewellery and investment, while 18K gold is more durable and better suited for daily wear and diamond jewellery.

7. What is 750 purity gold?

750 purity refers to 18K gold, meaning the jewellery contains 75% pure gold and 25% alloy metals, making it strong enough for intricate jewellery designs.

8. Is 995 purity 24 karat?

Yes. 995 purity is considered a form of 24K gold, containing 99.5% pure gold. It is commonly used for investment bars and certain gold coins rather than everyday jewellery.