What Does Carat Mean in Gold?

Many people often confuse the terms “carat” and “karat” while buying jewellery or learning about gold in carats, but both terms have completely different meanings. Carat is a unit used to measure the weight of gemstones such as diamonds, where one carat equals 200 milligrams. It helps determine the size and weight of precious stones.

On the other hand, karat gold refers to the purity of gold used in jewellery and ornaments. The higher the karat value, the greater the percentage of pure gold present in the item. For example, 24 karat gold is considered the purest form of gold available in the market, while 22K and 18K gold contain other metals mixed with pure gold to improve durability and strength.

Understanding the difference between carat and karat gold is important when purchasing jewellery, evaluating gold purity, or comparing different types of gold products. It helps buyers make more informed decisions based on purity, durability, and overall value.
 

How does karat differ from carat in gold?

Many buyers in India use the terms carat and karat interchangeably, but they refer to completely different things. Understanding the distinction helps you read jewellery labels correctly and make more informed purchases.

When used for gemstones — diamonds in particular — carat refers to weight. One carat equals 200 milligrams. A larger carat weight means a heavier stone, which typically means a higher price.

When used for gold, karat refers to purity — specifically, how many parts out of 24 are pure gold. A higher karat means more gold content. Here is a side-by-side comparison:

In India, both spellings — carat and karat — are commonly used when referring to gold purity. Whether a jeweller in Mumbai says 22 carat or 22 karat, they mean the same thing.

What is carat gold?

Carat gold refers to the measurement of the purity of gold, indicating the proportion of gold in a particular alloy out of a possible 24 parts. The term "carat" is often used in British English to describe this purity level. Pure gold, which is soft and malleable, is considered 24 carats. However, in practical applications, gold is often alloyed with other metals to enhance its strength and durability. As the carat number decreases, the proportion of pure gold decreases as well, with common carat levels being 18, 22, and 24. For example, 18-carat gold contains 18 parts gold and six parts other metals, making it 75% pure. This measurement is crucial in the jewellery industry, as it directly affects the gold's value, durability, and suitability for different types of adornments.
 

Origin of carat

The origin of the term "carat" traces back to ancient times when the carob seed was used as a standard of weight in trade. The uniformity of these seeds made them an ideal measure for small quantities, especially in the trading of precious gemstones. Over time, this method evolved, and the carat became a universal unit of weight for gemstones, particularly diamonds. In the Middle Ages, the carat was standardised as 200 milligrams. The adoption of the metric system further cemented its use globally. The term was later adapted to gold purity, where it represents the proportion of pure gold in an alloy. Thus, "carat" carries historical significance, linking ancient trade practices to modern-day measurements in the jewellery industry. 

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How karat is measured or stamped

Karat gold is measured based on the amount of pure gold present in a jewellery item or ornament. Gold purity is divided into 24 parts, where 24 karat represents the highest level of purity. Lower karat values indicate that other metals have been mixed with gold to improve durability and strength.

Here is how gold in carats is commonly measured:

• 24K gold – Contains almost pure gold and is considered the highest pure gold karat available.

• 22K gold – Contains 22 parts gold and 2 parts other metals such as copper or silver.

• 18K gold – Contains 18 parts pure gold and 6 parts alloy metals, making it more durable for regular wear.

Jewellers stamp these purity levels directly on jewellery items using markings such as “24K”, “22K”, or “18K”. These stamps help buyers identify the karat gold purity of the product.

In India, the BIS hallmark is one of the most reliable ways to verify gold purity. It usually includes the BIS logo, purity in carats, and the jeweller’s identification code, helping buyers confirm authenticity before purchase.

Uses of different karats levels across India 

Different types of gold in carats are used for different purposes based on their purity, durability, and appearance. Higher karat gold contains more pure gold, while lower karat gold includes additional metals that improve strength and make the jewellery more durable for everyday use.

Pure gold karat, such as 24K gold, is soft and mainly preferred for investment products like coins and bars. On the other hand, 22K and 18K gold are widely used for jewellery because they offer a balance between purity and durability. Lower karat gold is often chosen for lightweight and daily wear jewellery where strength matters more than high gold content.

Choosing the right karat gold depends on whether your priority is investment value, jewellery durability, or daily wear comfort.

How to check the purity of gold in carats

There are several simple ways to check the purity of gold in carats before buying or selling gold, or valuing jewellery for loan. Knowing the correct karat gold purity helps you understand the actual gold content and overall value of your jewellery.

• Check for the BIS hallmark stamp on jewellery to verify gold purity and authenticity.

• Look for markings such as 24K, 22K, or 18K that indicate karat gold value.

• A 22K stamp means the jewellery contains 22 parts pure gold and 2 parts alloy metals.

• Use a magnifying glass to identify small hallmark stamps clearly on the jewellery surface.

• Jewellers may use karat meters or purity testing machines for more accurate gold testing.

• A magnet test can help because pure gold is generally non-magnetic.

• Home tests may offer basic indications but are not fully reliable for exact purity checks.

• For accurate results, always get gold tested by a certified jeweller or authorised testing centre.

Purity and use of 1 carat gold

1 carat gold contains just 4.17% pure gold — the lowest purity level on the karat scale. At this level, the gold content is too low for use in jewellery or investment products. 1 carat gold is primarily used in industrial and technological applications where gold's properties — such as corrosion resistance and electrical conductivity — are needed in trace amounts.

You will not find 1 carat gold in any Indian jewellery market, and it does not qualify as collateral for a gold loan. For financial or ornamental purposes, 18K and above is the relevant range.

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How does carat influence gold value?

The carat meaning in gold is all about purity, and it plays a big role in deciding the value of your jewellery or investment. While weight matters, the carat rating tells you how much of that weight is actually pure gold karat. Understanding this difference helps when comparing gold pieces or making investment choices. 

• Higher carat gold: For example, 24 karat gold is pure and considered the most valuable since it contains no other metals.
• Lower karat gold: 1 karat gold has very little purity, while 18 or 14 karat gold mixes gold with other metals for strength.
• Karat gold meaning: It represents how much gold versus alloy is in your jewellery.
• Gold in carats: Higher purity suits investment, while lower carats are great for durable, everyday wear.
   

Different carat levels and their implications

Different carat levels in gold indicate varying degrees of purity, each with distinct implications for use, value, and durability. For instance, 24-carat gold is pure but soft, making it less suitable for everyday jewellery that requires durability. 22-carat gold, containing 91.67% pure gold, is slightly more robust but still maintains a high level of purity, making it popular for wedding bands and high-end jewellery. On the other hand, 18-carat gold, with 75% purity, strikes a balance between durability and purity, often used in intricate designs and settings. Lower carat gold, such as 14 or 9 carats, contains more alloyed metals, making it harder and more resistant to wear, suitable for everyday jewellery but less valuable in terms of gold content.

Note: It is important to note that Bajaj Finance offers gold loan only against 18-22 karat gold as collateral. 
 

Carat wise gold purity

Carat wise fineness

These tables provide a quick reference to understand how different carat levels correlate with gold purity and fineness, essential for making informed decisions in gold purchasing and investment.

Different carat levels and what they mean for gold loans in India

Understanding carat is not just useful when buying — it is equally important when pledging gold as collateral for a loan. The purity of your gold directly determines the loan amount you are eligible for.

Bajaj Finance offers gold loans against 18-22 karat gold jewellery and ornaments, and gold coins up to 24 karat purity. Gold below 18 karat — including 14K and 9K — does not qualify as collateral for a Bajaj Finserv Gold Loan.

The loan amount is calculated based on the purity and weight of your eligible gold, along with the RBI-prescribed LTV ratio. Bajaj Finance uses the lower of the average closing price for your gold's specific purity over the last 30 days or the previous day's closing price, as published by IBJA or a SEBI-regulated commodity exchange — keeping the valuation transparent and consistent.