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How to recognize real gold? The complete guide to checking 9K, 14K, or 18K
- February 9, 2026
- 1:34 p.m.
- Tom
- Share
When you want to sell gold jewelry, one question always comes up: is it really gold, and what is its karat?
Identifying the purity of your jewelry is essential to avoid unpleasant surprises and get the best price when selling.
In this clear and simple guide, discover how to recognize real gold and easily understand the different karats used in Belgium.
What is gold carat?
The karat (K) indicates the proportion of pure gold contained in a piece of jewelry.
Pure gold = 24 karats.
The higher the number of karats, the more gold the jewelry contains.
Here are the most common carats:
- 9K → 37.5% pure gold (marked 375)
- 14K → 58.5% pure gold (marked 585)
- 18K → 75% pure gold (marked 750) — the most common in Belgium
- 24K → pure gold (marked 999), too malleable for everyday jewelry
How to recognize real gold? 5 simple and reliable methods
Check the hallmarks (the most reliable method)
Each piece of solid gold jewelry bears an official hallmark indicating its karat:
- 375 → 9K gold
- 585 → 14K gold
- 750 → 18K gold
- 916 → 22K gold
- 999 → 24K gold
There are also symbols:
- eagle head → 18K
- balance → 14K
- shell → 9K
First step: check the hallmarks, often found near the clasp or inside the ring.
Testing gold with a magnet
Gold is not magnetic.
If your jewelry is attracted to a strong magnet, it is not solid gold, but a metal containing many alloys.
Observe the color of the metal
The color can give you a first clue:
- 18K → warm, uniform yellow
- 14K → slightly less intense yellow
- 9K → paler color, sometimes pink/coppery
- 24K → very bright yellow, almost orange
To be used as a simple reference, never as evidence.
Check the jewelry for wear and tear
If a silver or copper color appears under the gold layer:
It is not solid gold, but gold-plated.
Have your gold tested by an expert
For a 100% reliable answer, it is best to consult a professional.
An expert uses:
- a touchstone,
- test acids,
- a spectrometer (precise metal analysis).
This is the most reliable method for determining the exact carat weight.
Why does purity affect the price?
The more pure gold a piece of jewelry contains, the higher its value.
| Carat | % pure gold | Value |
| 9K | 37,5 % | € |
| 14K | 58,5 % | €€ |
| 18K | 75 % | €€€ |
| 24K | 99,9 % | €€€€ |
Would you like to know the real value of your gold jewelry?
Our experts perform:
- a detailed analysis of your jewelry
- a free, no-obligation estimate
- prompt payment at the best price of the day
We welcome you to our branches in:
Free estimate – Discreet service – Professional expertise
Key Takeaways
Gold protects your wealth during times of uncertainty.
It retains its value despite inflation.
Diversification enhances your security.
Physical gold gives you complete freedom.
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Personalized advice at the branch
In addition to online purchases, our experts are available to meet with you at one of our branches in Belgium to help you with your investment plan: choosing the right investment vehicle, setting a budget, and developing a diversification strategy tailored to your goals.
This consultation is free and requires no commitment. Take advantage of our hands-on experience to invest with confidence, with the same level of transparency as you’d find online.
Frequently Asked Questions
Can I purchase precious metals online or only in person?
L’Agence de l’or offers you complete freedom. You can make your investment directly on our e-commerce website, or visit one of our branches in Belgium to receive in-person advice.
Do you provide certificates of authenticity with the products purchased?
Absolutely. Every bullion bar and investment coin we offer for sale is rigorously inspected and always comes with its official certificate of authenticity, guaranteeing its purity and provenance.
What documents do I need to provide to buy or sell gold?
For any financial transaction involving precious metals, the law requires an identity verification process known as KYC (Know Your Customer). Whether you’re confirming an online payment or selling an item in a store, you’ll be asked to provide a valid form of identification to ensure the transaction is secure.
Can I pick up my online order directly at the store?
Yes, if you'd prefer to avoid shipping, you can select "pick up in store" when you place your order. Your order will be prepared and made available securely at the location of your choice.