Gold purity is measured in karats, which tells you how much of a piece of metal is actually gold and how much is made up of other metals mixed in with it. It can also be expressed as a percentage or a fineness number. All three ways of expressing purity describe the same thing, just in different formats.
Understanding what these numbers mean makes it much easier to compare gold jewelry, understand what you are paying for, and make a purchase you feel confident about.
What Karat Means
The karat scale runs from 0 to 24. Pure gold is 24 karats, meaning all 24 parts of the metal are gold with no other metals added.
In practice, pure gold is rarely used for jewelry. It is very soft, which means it scratches and bends easily under the conditions of daily wear. To make gold more durable, it is mixed with other metals such as silver, copper, zinc, or palladium. This mixture is called an alloy. The karat marking on a piece of jewelry tells you how many of the 24 parts are gold and how many are other metals.
A higher karat number means more gold content. A lower karat number means more of the metal is made up of other materials, which typically makes the piece stronger and more resistant to wear, but also means it contains less gold by proportion.
Common Purity Levels
24 karat gold is pure gold. It contains no other metals and has a distinctly rich, deep yellow color. Because it is soft, it is not commonly used in everyday jewelry. It is more often found in coins, bars, and certain traditional pieces where softness is less of a concern.
22 karat gold contains 22 parts gold and 2 parts other metals, making it about 91.6 percent pure gold. It is still quite soft compared to lower karat alloys but is commonly used in traditional and bridal jewelry, particularly in India and other parts of South Asia. The color is close to pure gold and the metal retains a warm, rich tone.
18 karat gold contains 18 parts gold and 6 parts other metals, which works out to 75 percent gold. It is the most popular choice for fine jewelry worldwide. It offers a good balance between gold content and durability, holds gemstone settings well, and still has a rich appearance. White gold and rose gold jewelry is often made in 18 karat.
14 karat gold contains 14 parts gold out of 24, which is about 58 percent gold. It is widely used in everyday jewelry, particularly in markets like the United States. It is harder and more scratch-resistant than higher karat options, making it practical for rings and bracelets that experience frequent contact and friction.
10 karat gold contains just under 42 percent gold and is the minimum legal standard for gold jewelry in several countries. It is the most durable of the common alloys and the most affordable, though its color tends to be paler and less warm than higher karat options.
How Karat Translates to Percentage
The conversion is straightforward. Divide the karat number by 24 and multiply by 100 to get the percentage of gold in the alloy.
24 karat is 100 percent gold. 22 karat is approximately 91.6 percent gold. 18 karat is 75 percent gold. 14 karat is approximately 58.3 percent gold. 10 karat is approximately 41.7 percent gold.
You may also see gold described using a fineness number, which is simply the percentage expressed as a number out of 1000. 18 karat gold has a fineness of 750, meaning 750 parts per thousand are gold. 22 karat gold has a fineness of 916. These numbers are sometimes stamped directly on jewelry alongside or instead of the karat marking.
Hallmarking and Certification
In India, gold purity is verified and certified through a system managed by the Bureau of Indian Standards, commonly known as BIS. The BIS hallmark is a quality assurance mark that confirms the gold in a piece meets the purity level claimed by the seller.
A BIS hallmarked piece of jewelry will carry a stamp that includes the BIS logo, the purity or fineness mark indicating the karat level, and an identification mark from the certified assaying and hallmarking centre that tested the piece. From 2021 onward, hallmarked jewelry in India also includes a six-character alphanumeric code called the HUID, which stands for Hallmark Unique ID. This code can be used to verify the piece through the BIS portal.
Buying hallmarked jewelry is important because it gives you an independent confirmation that the gold content is what the seller claims. Without hallmarking, the purity stated on the label or by the seller cannot be independently verified at the point of purchase.
When shopping for gold jewelry in India, always look for the BIS hallmark. It is the simplest and most reliable way to confirm you are getting the purity you are paying for.
Why Purity Matters When Buying
Purity affects three things that matter directly to buyers: appearance, durability, and price.
Appearance changes with karat level. Higher karat gold has a deeper, warmer yellow tone because the color of the metal is closer to pure gold. Lower karat alloys can appear slightly paler or have a different undertone depending on what metals have been added.
Durability works in the opposite direction. Lower karat gold is harder and more resistant to scratching because the added metals strengthen the alloy. A 14 karat ring worn daily will generally hold its shape and surface finish longer than an 18 karat ring under the same conditions.
Price follows gold content. Since gold is the valuable component of the alloy, a higher karat piece costs more per gram than a lower karat piece of the same weight. When comparing jewelry on price, it is worth factoring in the karat level alongside the weight to understand what you are actually paying for the gold itself.
Understanding these trade-offs helps you choose a purity level that suits how you plan to wear the piece, what appearance you prefer, and what your budget allows.
Making Sense of It All
Gold purity is not complicated once you understand the scale. Karats measure how much of the metal is gold out of a possible 24 parts. Higher karats mean more gold, a richer color, and a higher price, but also a softer metal. Lower karats mean a stronger, more practical alloy at a more accessible price point.
When buying gold jewelry, check the karat marking, look for hallmarking from a recognized authority like BIS, and think about how the purity level fits your intended use. A piece you plan to wear every day has different requirements from one you will wear occasionally for special events.
With that framework in place, reading a gold jewelry listing and understanding what it means becomes straightforward.
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