Imagine a pizza cut into 24 slices. If you eat 24 slices, you ate a whole pizza. If you eat 22 slices, you ate most of it but two slices are still on the plate. Gold purity works almost exactly like that — and the number on a piece of jewelry tells you "how many slices of pure gold" you're holding out of 24.

The karat scale

Karat measures the proportion of pure gold in an alloy. Out of every 24 parts of the metal:

  • 24K — 24/24 = 99.9% pure. The softest, most expensive grade. Used for investment bars, central-bank reserves, and most coins. Too soft for daily-wear jewelry.
  • 22K — 22/24 ≈ 91.6%. Slightly harder than 24K. Popular for premium jewelry in the Gulf, India, and Asia.
  • 21K — 21/24 ≈ 87.5%. The standard for jewelry in Egypt and Saudi Arabia. Balances purity with durability.
  • 18K — 18/24 = 75%. The international "fine jewelry" standard. Hard enough for rings and watches; still feels rich.
  • 14K — 14/24 ≈ 58.3%. Common in the US and Europe. Affordable and durable but visibly less yellow.

Why pure gold isn't always best

Pure gold is wonderful for investment but terrible for a ring you wear every day. It bends if you grip something hard. Scratches easily. Loses its shape over years. Adding other metals (copper, silver, palladium) creates an alloy that's harder, more scratch-resistant, and still mostly gold.

So the karat number is a trade-off: higher purity = softer + more expensive; lower purity = harder + cheaper. There's no "best" — just the right karat for the use case.

How karat affects price

If 24K gold costs $80 per gram on the day you buy:

  • 22K (91.6% gold) is worth roughly $73 per gram of metal value, before workmanship.
  • 21K (87.5%) → ~$70/g of metal.
  • 18K (75%) → ~$60/g.
  • 14K (58.3%) → ~$47/g.

That's the metal value. Real retail price adds workmanship, dealer margin, taxes (VAT in some countries), and design. A 21K bracelet might cost double its raw gold value at a high-end jeweller.

If you're buying gold to wear, pick by hardness preference (and local standard). If you're buying gold to store value, go 24K — every other karat costs you a workmanship premium you'll lose on resale.

For a gold watcher

DahabPro's wallet tracker and zakat calculator handle every karat correctly — internally they convert all karats to "24K-equivalent grams" using the exact fractions above. So a 100g 21K bracelet shows up as 87.5g 24K-equivalent in your portfolio total, which is what zakat (and resale) actually cares about.