Gold Karats Explained: 9K, 10K, 14K and 18K
Every piece of gold jewelry carries a number: 9K, 10K, 14K, 18K. That number is the karat, and it tells you one thing only: how much of the metal is pure gold. It affects colour, weight, price and how the piece is regarded in different countries, so it is worth understanding before you choose.
Quick Answer
Pure gold is 24 karat. A karat number is simply parts of gold out of 24. 18K gold is 18 parts gold and 6 parts other metals, which is 75% pure gold. The higher the karat, the more gold the piece contains and the richer its colour.
How Much Gold Is in Each Karat?
| Karat | Pure gold | Common hallmark |
|---|---|---|
| 9K | 37.5% | 375 |
| 10K | 41.7% | 417 |
| 14K | 58.3% to 58.5% | 583 or 585 |
| 18K | 75% | 750 |
| 24K | 99.9% | 999 |
The hallmark is the small number stamped inside a ring or on a clasp. It states purity in parts per thousand, so 750 means 750 parts gold in every 1,000.
Why Is Gold Mixed With Other Metals?
Pure gold is soft. On its own it bends and scratches too easily to hold a diamond securely for years of wear. Jewelers alloy it with metals such as copper, silver, zinc or palladium to add strength. The same alloy metals also create the colour: more copper gives rose gold, and white metals give white gold.
How the Karats Compare in Daily Wear
18K gold
18K has the deepest, warmest gold colour of the karats commonly used for diamond jewelry, and it is three-quarters pure gold. It is the traditional standard for fine jewelry and engagement rings, and it is strong enough for prong settings when the piece is well made.
14K gold
14K contains a little over half pure gold. Its colour is slightly lighter than 18K and it is somewhat harder, which some people like for pieces worn every day.
9K and 10K gold
These contain less than half pure gold. The colour is paler and the price is lower. They are a practical way to own a gold piece on a smaller budget.
Does Karat Change How the Diamond Looks?
No. The diamond is the same stone in any metal. What changes is the frame around it: 18K yellow gold gives a richer contrast, while white gold lets the eye go straight to the stone. If you are deciding on colour as well, read our guide to yellow, white or rose gold.
Karat and Where You Live
Countries set their own rules on which purities may be described and hallmarked as gold, and local taste differs too. In the Gulf, buyers traditionally favour higher karats, and 18K is the familiar standard for diamond jewelry. If you are buying a gift for someone in another country, it is sensible to choose the karat that is well regarded where they live.
How to Choose
- For an engagement ring or a lasting gift: 18K is the classic choice.
- For the richest colour: choose 18K yellow or rose gold.
- For a first fine piece on a smaller budget: a lower karat keeps the same design and the same lab-grown diamond at a lower price.
- Always: check the hallmark, and make sure the product page states the metal and karat clearly.
Frequently Asked Questions
Is 18K gold real gold?
Yes. 18K gold is 75% pure gold alloyed with other metals for strength.
Is 18K gold too soft for a ring?
No. 18K is widely used for engagement and wedding rings. Like any fine jewelry it will pick up light surface marks over time, and it can be polished.
What does 750 stamped on jewelry mean?
It is the hallmark for 18K gold: 750 parts pure gold per 1,000.
Is karat the same as carat?
No. Karat (K) measures gold purity. Carat (ct) measures diamond weight. Our guide to carat weight explains the second one.
Talk to Us Before You Decide
Not sure which karat suits the piece you have in mind? Message us on WhatsApp at +971 55 48 18 610 or email concierge@fidroyaljewelry.com, and a member of our team will help you personally.
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