Difference Between 24K, 22K, 21K, 18K and 14K Gold

Karat measures how much of a gold item is pure gold and how much is other metal. This guide explains each common purity, where it is used, and how it affects price and durability.

What Karat Means

Karat is a measure of purity out of 24 parts. Gold that is 24 karat is pure gold, with all 24 parts being gold. Gold that is 18 karat has 18 parts gold and 6 parts other metals, which means it is three-quarters pure gold. The other metals are called alloys, and they are added deliberately to change the metal's colour, hardness, and working properties.

You may also see purity expressed as fineness in parts per thousand. In that system, 24K is 999 fine, 22K is about 916 fine, 18K is 750 fine, and 14K is about 585 fine. Jewellers often stamp one of these numbers on a piece, and the stamp is a useful check alongside any certificate or receipt.

24K Gold: Pure but Soft

24K gold is the purest form and carries the highest value per gram, since every gram is gold. It has a rich, deep yellow colour that many people love. However, pure gold is soft and scratches and dents easily, which makes it less suitable for everyday jewellery that takes knocks, such as rings worn daily.

For that reason, 24K gold is most often found in investment bars and coins, where purity matters more than hardness, and in some traditional jewellery made for special occasions rather than daily wear. When you buy 24K, you are paying for maximum gold content and minimum alloy.

22K and 21K Gold: The Jewellery Favourites in Many Markets

22K gold is about 91.7 percent pure gold, with the rest made up of alloy metals such as copper or silver. It is the standard for much traditional jewellery in South Asia and the Middle East, where buyers value high gold content and a warm yellow colour. It is harder than pure gold, so it holds its shape better, while still feeling unmistakably like gold.

21K gold, about 87.5 percent pure, is common in parts of the Middle East. It sits between 22K and 18K in both gold content and durability, and it is popular for traditional designs where a high gold content is expected but a little extra hardness is welcome. If you are buying in a market where 21K is standard, comparing its price with 22K elsewhere requires adjusting for the purity difference.

18K Gold: The Balance of Beauty and Strength

18K gold is 75 percent pure gold and is the most widely used purity for fine jewellery in Europe and North America. It is hard enough for rings, bracelets, and settings that hold gemstones securely, yet it still contains enough gold to give a warm colour and a substantial feel. It is also the purity at which white gold and rose gold are most commonly made, by varying the alloy metals.

For everyday fine jewellery, 18K is often the best compromise. It resists scratches better than 22K or 24K, holds stones firmly, and can be crafted into finer, more detailed designs. Its price per gram is lower than 22K or 24K, because a quarter of its weight is alloy rather than gold, but its durability often makes it the better long-term choice for pieces worn every day.

14K Gold: Hard-Wearing and Affordable

14K gold is about 58.3 percent pure gold, with the rest made up of alloys. It is noticeably harder and more resistant to wear than higher purities, which makes it popular for everyday jewellery in North America, especially rings and bracelets that take a lot of contact. Its colour is slightly paler than 18K, though still clearly gold.

Because less than three-fifths of its weight is gold, 14K jewellery costs less per gram than higher purities, which makes it an accessible entry point for gold jewellery. When comparing prices, always compare like with like: a heavier 14K piece can cost more in total than a lighter 18K piece, even though the 18K piece has a higher value per gram.

How Purity Affects Price and Resale

Price per gram rises directly with purity, because you are paying for more gold and less alloy. A gram of 24K gold is worth more than a gram of 18K gold, which in turn is worth more than a gram of 14K gold, at the same spot price. To compare fairly, multiply the weight by the purity fraction — for example, 0.75 for 18K — to find the fine gold content, then value that content at the pure gold price.

On resale, the same logic applies. A dealer will value your piece by its fine gold content, not its total weight, and will pay accordingly. Keeping the original receipt, certificate, or hallmark helps here, because it proves the purity without the need for testing, and it can make the selling process smoother and the offer fairer.