What Does Karat Actually Mean?
Gold purity is measured in karats, where 24 karats represents pure gold (99.9% gold content). Every karat below 24 represents a proportional reduction in gold content, with the remainder made up of other metals — typically silver, copper, or zinc — added to improve hardness and workability.
- 24K: 99.9% pure gold. Softest, deepest yellow, highest value per gram.
- 22K: 91.67% gold. The jewellery standard across the Middle East, India, and Southeast Asia.
- 21K: 87.5% gold. Popular in Arab-style jewellery and Gulf countries.
- 18K: 75% gold. The Western fine jewellery standard. Harder, more scratch-resistant.
Why Not Everyone Buys 24K
Pure gold (24K) is remarkably soft. A 24K ring worn daily would scratch, bend, and lose its shape within weeks. The alloy metals added in 22K, 21K, and 18K make the gold significantly harder and more suitable for jewellery designed to be worn regularly. So the karat question is not just about purity — it is about the intended use of the gold.
24K Gold: Best For Investment
For anyone buying gold as a store of value or investment, 24K is the only serious choice. Investment gold bars and coins are almost universally 24K (or very close to it — the LBMA standard for good delivery bars is 99.5% minimum). In the UAE, investment-grade gold (24K bars and coins) is VAT-exempt at the point of sale — a meaningful advantage.
When you eventually sell, bullion dealers buy back at close to the current spot price with a small margin. The round-trip cost on a 24K bar is typically 2–4% of the gold value. Compare this to jewellery, where the making charges (10–30% of purchase price) are entirely lost on sale.
22K Gold: Best for Jewellery With High Gold Content
22K is the dominant jewellery standard in the UAE, India, and much of the Middle East because it offers a near-ideal balance: very high gold content (91.67%) for a rich, deep colour, with enough alloy to be practical for everyday wear and complex designs. Most jewellery in the Dubai Gold Souk is 22K.
If you are buying jewellery as a gift, for a wedding, or for personal use and you value high gold content, 22K is the right choice. The deeper yellow colour is also culturally significant in many communities.
21K Gold: The Gulf Standard
21K (87.5% purity) is particularly common in traditional Arab-style jewellery — heavy bangles, chains, and bridal sets. It offers a middle ground between the richness of 22K and the durability advantages of lower karats. If you see "875" stamped on a piece, that is the hallmark for 21K gold.
18K Gold: Best for Diamond and Stone-Set Jewellery
18K gold (75% purity) is the Western fine jewellery standard, and for good reason: the higher alloy content makes it significantly harder than 22K or 24K, which means it holds prong settings and fine details better — critical when a piece contains diamonds or precious stones. Most international designer jewellery brands (Cartier, Bulgari, Van Cleef & Arpels) work in 18K.
The trade-off is a slightly less intense yellow colour (or a better base for white gold and rose gold variants) and a lower gold content per gram, meaning you are paying more per gram for the craftsmanship relative to the metal.
How to Check the Karat of Your Gold
All legally sold gold jewellery in the UAE must carry a hallmark stamp indicating its purity:
- 999 or 9999 = 24K (99.9% or 99.99%)
- 916 = 22K (91.6%)
- 875 = 21K (87.5%)
- 750 = 18K (75%)
This stamp is usually inside a ring, on the clasp of a necklace, or on the back of a pendant. If a piece does not carry a hallmark, ask the retailer — in the UAE, it is a legal requirement.
The Bottom Line
Buy 24K bars or coins if your goal is investment. Buy 22K if you want high-gold-content jewellery in the traditional Middle Eastern or South Asian style. Choose 18K for stone-set or designer pieces where durability and setting quality matter more than maximum gold content. Always check the hallmark and verify the weight against the day's gold rate before paying.