Gold jewellery is timeless and versatile, but understanding gold purity is essential before you buy. The karat you choose affects price, durability and colour.
Understanding gold purity: the karat system
Gold purity is measured in karats (K). Pure gold is 24K, but it is too soft for everyday wear, so it is alloyed with other metals to make jewellery more durable.
| Karat | Purity | Durability | Common uses |
|---|---|---|---|
| 24K | 99.9% | Very soft | Coins, ceremonial pieces, bars |
| 22K | 91.6% | Moderately soft | High-end jewellery, bangles, necklaces |
| 21K | 87.5% | Moderately durable | Traditional gold jewellery |
| 18K | 75% | Durable | Luxury rings, earrings, diamond settings, everyday pieces |
| 14K | 58.3% | Highly durable | Daily-wear rings and bracelets |
Which karat should you choose?
- 22K is popular for traditional pieces and items that face little friction, such as necklaces and bangles, and is most valued for investment or ceremonial gold.
- 21K is a regional favourite that balances a rich gold colour with reasonable durability.
- 18K balances purity and strength — ideal for rings, earrings and everyday designs, and the best choice for diamond settings.
- 14K is the most durable, suited to jewellery worn hard every day.
A few final tips
- Look for hallmarks and certification to confirm authenticity.
- Higher karats are softer and more yellow; lower karats are harder with a lighter hue.
- Match the karat to the wearer's lifestyle and how often the piece will be worn.
At AAZ Jewellery we craft in 18K, 21K and 22K gold. If you are choosing a diamond piece, our guide to GIA certificates and diamond types will help, or explore our collection to find pieces in the karat that suits you.
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