How to Check Gold Purity Before Buying: Hallmark, HUID & Purity Marks Explained

Buying gold jewellery is a significant investment, whether you are shopping for a wedding, festival, special occasion, or everyday wear. But how can you be sure that the gold jewellery you are buying has the purity claimed by the seller?

Understanding gold purity, BIS hallmarking, HUID numbers, and purity marks can help you make a more informed purchase and avoid confusion when comparing jewellery.

In India, gold jewellery is commonly available in different purity levels such as 22K, 18K and 14K. Knowing what these numbers mean and how to verify them is an important part of buying gold jewellery.

In this guide, we explain how to check gold purity before buying, how to read gold purity marks, what HUID means, and what you should check on your jewellery and invoice.

What Is Gold Purity?

Gold purity refers to the percentage of actual gold present in a jewellery item or gold product.

Pure gold is generally considered to be 24 karat (24K) gold, which has a very high gold content. However, pure gold is relatively soft, which makes it less suitable for many types of jewellery.

Jewellery is therefore often made by combining gold with other metals to improve its strength, durability and appearance.

For example:

24K gold – approximately 99.9% pure gold
22K gold – approximately 91.6% gold
18K gold – approximately 75% gold
14K gold – approximately 58.5% gold

The remaining percentage consists of other metals used to create a stronger and more durable jewellery alloy.

How to Check Gold Purity Before Buying Jewellery

Before purchasing gold jewellery, there are several important things you can check.

1. Look for the BIS Hallmark

One of the first things buyers should check is whether the jewellery carries the appropriate BIS hallmark.

Hallmarking provides information about the purity or fineness of precious-metal jewellery and helps buyers identify the declared purity of the product.

Instead of relying only on the appearance or colour of gold, look for the required hallmark details on the jewellery.

2. Check the HUID Number

Modern hallmarked gold jewellery in India carries a Hallmark Unique Identification (HUID) number.

The HUID is a unique alphanumeric identification associated with the hallmarked jewellery article.

Buyers can use the relevant BIS verification facility to check the details associated with the HUID.

This provides an additional way to verify hallmark information rather than simply relying on a verbal claim about purity.

3. Check the Purity or Fineness Mark

Gold jewellery may also display a fineness number indicating its gold content.

Some commonly encountered numbers include:

Purity Mark	Approx. Gold Content	Karat
999	99.9%	24K
916	91.6%	22K
750	75.0%	18K
585	58.5%	14K

For example, if jewellery is marked 916, it indicates approximately 91.6% gold content, corresponding to 22K gold.

4. Check the Jewellery Bill

The jewellery bill is another important part of your purchase.

Before paying, check that the invoice clearly describes the jewellery and its relevant details, including information such as:

Gold purity
Net gold weight
Gross weight
Making charges
Applicable taxes
Product description
Other applicable charges

A transparent invoice makes it easier to understand what you are actually paying for.

5. Buy From a Trusted Jeweller

Gold purity is not something that should be judged only by looking at the colour or shine of jewellery.

Buying from a reputable and transparent jeweller can make the purchasing process easier because you can ask questions about purity, hallmarking, weight, pricing and making charges before completing the purchase.

What Do 916, 750 and 999 Mean in Gold?

Gold purity is often represented using a fineness number.

The number indicates the amount of gold per 1,000 parts.

999 Gold

999 gold contains approximately 999 parts of gold per 1,000 parts, or about 99.9% gold.

This is associated with very high-purity gold and is commonly discussed in relation to 24K gold.

916 Gold

916 gold contains approximately 916 parts of gold per 1,000 parts.

This corresponds to approximately 91.6% gold and is commonly referred to as 22K gold.

22K gold is widely used for traditional Indian jewellery because it offers a balance between high gold content and greater durability than pure 24K gold.

750 Gold

750 gold contains approximately 750 parts of gold per 1,000 parts, or 75% gold.

This corresponds to 18K gold.

18K gold is commonly used for jewellery where additional strength and design flexibility are important.

What Is a BIS Hallmark?

A BIS hallmark is an official quality-marking system associated with the Bureau of Indian Standards.

For consumers, hallmarking is important because it provides information about the declared purity of precious-metal jewellery.

When purchasing hallmarked gold jewellery, buyers should carefully examine the hallmark details rather than assuming that every gold-coloured item has the same purity.

The hallmark and associated identification details can help provide greater transparency when purchasing jewellery.

What Is HUID in Gold Jewellery?

HUID stands for Hallmark Unique Identification.

It is an alphanumeric identification number associated with an individual hallmarked jewellery article.

The purpose of HUID is to provide a traceable identification for hallmarked jewellery.

When buying gold jewellery, you should look for the applicable hallmark information and HUID details and verify them through the official BIS system where applicable.

This is particularly useful for buyers who want to verify the hallmark information associated with their jewellery.

Can You Check Gold Purity at Home?

You may find many online suggestions for checking gold at home using magnets, vinegar, water, ceramic plates or other household methods.

However, these methods should not be treated as definitive proof of gold purity.

For example, a magnet test may help identify certain non-gold materials, but it cannot reliably tell you whether a piece is 22K, 18K or another purity.

Similarly, household chemical tests can be inaccurate and may damage jewellery.

For a reliable assessment, use recognised hallmark information and, when necessary, professional testing through an appropriate facility.

How to Check If Your Gold Jewellery Is 22K?

If you are purchasing jewellery advertised as 22K gold, look for the relevant purity/fineness marking and hallmark information.

For 22K jewellery, the commonly used fineness number is 916, representing approximately 91.6% gold.

You should also check the HUID and the purchase invoice.

A simple checklist is:

22K gold = approximately 91.6% gold = 916 fineness

However, don't rely on a single marking alone. Check the complete hallmark and purchase documentation.

22K vs 18K vs 24K Gold: Which Is Better?

There is no single gold purity that is best for everyone. The right choice depends on how you plan to use the jewellery.

Gold Type	Approx. Purity	Best Suited For
24K	99.9%	Very high-purity gold products
22K	91.6%	Traditional gold jewellery
18K	75%	Durable, detailed and contemporary jewellery
14K	58.5%	Jewellery where greater alloy strength is preferred

24K Gold

24K gold offers very high purity but is softer than lower-karat gold.

22K Gold

22K gold provides a high gold content while being more practical for many traditional jewellery designs.

18K Gold

18K gold contains a higher proportion of alloy metals, which can provide additional durability and make it suitable for intricate or contemporary designs.

The best option depends on your jewellery design, usage, preferred appearance and budget.

Why Is 24K Gold Not Commonly Used for Jewellery?

Pure gold is relatively soft.

Jewellery needs to withstand regular handling, wearing, bending and everyday friction. Mixing gold with other metals can increase its strength and durability.

This is why jewellery is commonly made using purities such as 22K and 18K rather than 24K.

The choice of purity therefore involves more than simply choosing the highest possible gold percentage.

What Should You Check Before Buying Gold Jewellery?

Before finalising your purchase, use this checklist:

Gold Purity Buying Checklist

Check the applicable BIS hallmark.
Check the HUID where applicable.
Check the fineness/purity marking.
Confirm whether the jewellery is 22K, 18K or another purity.
Check the net gold weight.
Ask about making charges.
Review the complete invoice.
Understand any additional charges.
Ask questions if any detail is unclear.
Purchase from a reputable jeweller.

Taking a few minutes to verify these details can make your gold-buying experience much more transparent.

Common Mistakes to Avoid When Buying Gold

Choosing Jewellery Only by Appearance

Gold colour and shine cannot tell you the exact purity of jewellery.

Ignoring the Hallmark

Don't skip checking the hallmark and associated identification details.

Confusing Gross Weight With Gold Weight

Jewellery may contain stones, beads or other materials. Gross weight and net gold weight can therefore be different.

Not Asking About Making Charges

The final price of jewellery isn't determined only by the daily gold rate. Making charges and other applicable components can affect the total cost.

Not Checking the Invoice

Always review the purchase documentation before completing the transaction.

Relying on DIY Purity Tests

Household tests can be unreliable and may damage jewellery. Use recognised hallmarking and professional verification methods instead.

How Is the Price of Gold Jewellery Calculated?

The final price of gold jewellery can include several components.

A simplified calculation may involve:

Gold value + making charges + applicable taxes/other charges = final purchase price

The gold value itself depends on factors such as the applicable gold rate, purity and net gold weight.

For example, 22K jewellery and 18K jewellery contain different proportions of gold, so comparing their prices requires you to consider purity as well as weight.

This is why buyers should look beyond the displayed gold rate and understand the complete invoice.

FAQs About Gold Purity

How can I check gold purity before buying?

Check the applicable BIS hallmark, HUID, fineness/purity marking and purchase invoice. If you require further verification, professional testing may be appropriate.

What does 916 mean in gold?

916 indicates approximately 91.6% gold content and is commonly associated with 22K gold.

What does 750 mean in gold?

750 indicates approximately 75% gold content and corresponds to 18K gold.

What does 999 mean in gold?

999 indicates approximately 99.9% gold content and is associated with very high-purity, commonly 24K, gold.

Is 22K gold pure gold?

No. 22K gold is approximately 91.6% gold. The remaining portion consists of other metals used to improve strength and durability.

Is 24K gold better than 22K gold?

Not necessarily. 24K gold has higher purity, but it is softer. 22K gold contains slightly less gold but is generally more practical for many jewellery applications.

Can I check gold purity using a magnet?

A magnet test is not a reliable way to determine the exact purity of gold jewellery. It should not replace hallmark and professional verification methods.

What is HUID in gold?

HUID stands for Hallmark Unique Identification. It is an alphanumeric identification associated with a hallmarked jewellery article and can be used to verify relevant hallmark information through the appropriate BIS system.

Final Thoughts

Knowing how to check gold purity can help you make a more informed jewellery purchase. Instead of relying only on the appearance of gold or informal testing methods, pay attention to the BIS hallmark, HUID, fineness number, net gold weight and purchase invoice.

Whether you are buying 22K traditional jewellery, 18K contemporary designs or another type of gold product, understanding purity and pricing can help you compare options with greater confidence.

When buying gold jewellery, transparency matters. Choose a trusted jeweller, ask questions about purity and charges, and always review the purchase details before making your final decision.