24K vs 22K vs 21K vs 18K Gold: What's the Difference?
When buying gold jewellery in Pakistan, you may come across 24K, 22K, 21K, and 18K gold. The main difference is gold purity—the percentage of pure gold in the item.
Higher-karat gold contains more pure gold, while lower-karat gold generally contains more alloying metals, which can improve strength and durability.
Gold Purity Comparison Table
| Gold Type | Gold Purity | Common Uses |
|---|---|---|
| 24K | Approximately 99.9% | Gold bars and bullion |
| 22K | 91.67% | Traditional gold jewellery |
| 21K | 87.5% | Gold jewellery |
| 18K | 75% | Rings, watches and gemstone jewellery |
What Does Karat Mean in Gold?
Karat (K) measures gold purity on a scale of 24 parts.
The formula is:
Gold Purity = Karat ÷ 24 × 100
For example, 22K gold contains 22 parts gold out of 24, giving it approximately 91.67% purity.
The remaining percentage consists of other metals, which can affect the gold's strength and colour.
24K Gold: Highest Purity
24K gold is approximately 99.9% pure and is commonly used for gold bars, bullion, and investment products.
It has a rich yellow colour but is relatively soft, making it less suitable for some jewellery designs intended for frequent wear.
22K Gold: Popular for Traditional Jewellery
22K gold contains approximately 91.67% pure gold. It offers high gold content while being harder than 24K gold.
It is commonly used for bangles, necklaces, earrings, and bridal jewellery in Pakistan.
21K Gold: High-Purity Jewellery
21K gold contains 87.5% pure gold. It has slightly less gold than 22K and a greater proportion of alloying metals.
Its appearance and durability depend on the alloy composition and jewellery design.
18K Gold: Strength and Versatility
18K gold contains 75% pure gold and 25% other metals. It is generally harder than higher-karat gold and is often used for rings, watches, diamond jewellery, and designs intended for regular wear.
Although its underlying gold value is lower for the same weight, branded or gemstone jewellery can still be expensive.
How to Calculate 22K, 21K and 18K Gold Prices
If you know the 24K gold rate, you can estimate the value of other karats using these formulas:
- 22K rate: 24K rate × 22 ÷ 24
- 21K rate: 24K rate × 21 ÷ 24
- 18K rate: 24K rate × 18 ÷ 24
For example, if 24K gold costs Rs400,000 per tola:
| Gold Type | Estimated Rate per Tola |
|---|---|
| 24K | Rs400,000 |
| 22K | Rs366,667 |
| 21K | Rs350,000 |
| 18K | Rs300,000 |
These are theoretical metal-value estimates, not live market quotes. Actual buying and selling rates may differ.
What Do 916, 875, 750 and 999 Gold Mean?
Gold purity is also expressed using fineness markings.
| Marking | Approximate Purity | Equivalent Karat |
|---|---|---|
| 999 | 99.9% | 24K |
| 916 | 91.6% | 22K |
| 875 | 87.5% | 21K |
| 750 | 75% | 18K |
These markings help buyers understand gold purity, but the item's authenticity should be verified where necessary.
Which Gold Is Best for Jewellery or Investment?
The best option depends on your purpose.
- 24K gold: Suitable for high-purity bullion and investment products.
- 22K gold: A popular choice for traditional jewellery with high gold content.
- 21K gold: An alternative for buyers seeking high-purity jewellery.
- 18K gold: Often suitable for durable designs, rings, and gemstone settings.
Higher purity does not automatically mean better jewellery. Durability, design, craftsmanship, and intended use also matter.
How Is Gold Jewellery Value Calculated?
To estimate the raw gold value of jewellery, use:
Gold Value = Weight in Grams × Karat ÷ 24 × 24K Price per Gram
For example, if you have 10 grams of 22K gold and the 24K rate is Rs40,000 per gram:
10 × 22 ÷ 24 × 40,000 ≈ Rs366,667.
This estimate excludes making charges, gemstones, dealer deductions, and other costs. When selling jewellery, the amount received may be lower than its original purchase price.
Frequently Asked Questions
Is 24K gold better than 22K gold?
24K has higher purity, but 22K is generally more practical for traditional jewellery because it is harder.
Is 916 gold the same as 22K?
Yes. The 916 marking represents approximately 91.6% gold, corresponding closely to 22K.
Why is 18K gold cheaper than 22K?
For the same weight, 18K contains less pure gold, so its underlying metal value is generally lower.
Which gold is strongest: 24K, 22K, 21K or 18K?
Generally, 18K gold is harder than 21K, 22K, and 24K gold. Actual durability also depends on alloy composition and design.
Does higher-karat gold have a higher resale value?
Higher-karat gold contains more pure gold per gram, but resale value also depends on the current rate, verified purity, dealer buying price, and deductions.
Final Thoughts
The key difference between 24K, 22K, 21K, and 18K gold is the percentage of pure gold they contain. Higher-karat gold generally has greater underlying gold value, while lower-karat gold can offer greater strength for jewellery.
Before buying or selling gold in Pakistan, compare the purity, net gold weight, current market rate, and making charges.
Disclaimer: This article is for educational purposes only. Gold prices and jewellery charges vary between markets and sellers. Verify the current rate and purity before making a transaction.