What does "karat" mean?
Karat (written as K or kt) measures how pure gold is. Pure gold is soft. To make it strong enough for daily wear, jewellers mix it with other metals like copper, silver or zinc. The karat number tells you how much of the metal is real gold.
The scale runs out of 24. So 24K means all 24 parts are gold. 22K means 22 parts are gold and 2 parts are other metals. The lower the number, the less gold and the more mixed metal.
Do not confuse karat with "carat." Carat (ct) is a unit of weight for gemstones like diamonds. Karat is about gold purity. They sound the same but mean different things.
24K vs 22K vs 21K vs 18K: the purity levels
Here is the quick comparison most buyers need. These purity figures are fixed standards used worldwide.
| Karat | Gold purity | Common use | Feel |
|---|---|---|---|
| 24K | 99.9% | Bars, coins, investment | Softest, brightest yellow |
| 22K | 91.6% | Jewellery (South Asia, Gulf) | Rich colour, fairly strong |
| 21K | 87.5% | Jewellery (Gulf, Middle East) | Strong, warm colour |
| 18K | 75% | Fine and designer jewellery | Very durable, lighter tone |
You will sometimes see 22K marked as "916" and 18K marked as "750" on a hallmark. These numbers are just the purity written as parts per thousand: 916 for 91.6% and 750 for 75%.
Why is 22K so popular for jewellery?
In Pakistan, India and much of the Gulf, 22K is the favourite for jewellery. There are good reasons for this.
- Rich gold colour. At 91.6% purity, 22K keeps that deep yellow shine people love, while still holding its shape.
- Strong enough to wear. Pure 24K bends and scratches too easily for rings and bangles. The small amount of mixed metal in 22K makes it much tougher.
- Good resale value. Because it is high purity, 22K holds most of its gold value when you sell it back.
- Tradition and trust. Families pass down 22K sets. Jewellers stock it widely, so buying and selling is easy.
18K is more common in Western countries and for diamond or gemstone settings, where extra strength matters more than deep colour. 21K sits between the two and is very popular across the Gulf.
Which karat should you buy?
For jewellery you will wear
Choose 22K or 21K if you want that classic gold look with good strength. Choose 18K if you want maximum durability, a slightly lighter tone, or if the piece holds diamonds and delicate stones. Avoid 24K for everyday rings and bracelets, as it dents easily.
For investment
If your goal is to store value, 24K bars and coins are usually the better choice. They are the purest form, they are priced close to the market spot rate, and they carry little or no making charge. Jewellery, by contrast, includes making charges that you rarely get back when you sell.
This is general information, not financial advice. Always check the live rate and confirm details with a trusted local dealer before you buy or sell.
How karat affects resale value
When you sell gold back, most dealers pay based on the actual gold content, not the shape or design. So purity drives the resale price.
- A 24K item returns close to the full market value of its weight.
- A 22K item returns about 91.6% of the pure-gold value for its weight.
- An 18K item returns about 75% of the pure-gold value for its weight.
Here is a simple, hypothetical example. Say pure gold trades at $2,000 per troy ounce. One troy ounce is 31.1035 grams, so that is about $64.30 per gram of pure gold. A 10-gram 22K chain then holds roughly 9.16 grams of pure gold, worth about $589 in gold content. The same 10 grams in 18K holds only 7.5 grams of pure gold, worth about $482. These numbers are only to show the method, not a real price.
Two more things reduce what you get back: making charges (the fee for crafting the piece) and any dealer deduction for melting or testing. Higher karat means more gold value, but making charges are usually lost on resale no matter the karat.
Quick tips before you buy
- Check the hallmark stamp (24K, 22K, 916, 750, and so on) so you know the true purity.
- Ask for the making charge separately, so you can compare jewellers fairly.
- Match the karat to the purpose: higher for value, lower for durable daily wear.
- Compare the shop's rate with the live market rate on GoldRate before you commit.
Once you understand karats, gold shopping gets much simpler. You will know exactly what you are paying for and what you can expect back later.