A jeweler in Dubai's Gold Souk recently handed a customer a bracelet stamped "18K" — priced accordingly at AED 420.63 per gram — but an independent assay test later showed it was closer to 14K gold. At today's live prices, that difference translates to roughly AED 113 per gram in pure value that the buyer simply never received. Knowing how to verify gold purity yourself, before money changes hands, is not a paranoid habit. It is the most basic financial literacy a jewelry buyer in this market can have.
Understanding Karat Stamps and What They Actually Mean
The karat system is a fraction out of 24. Pure gold is 24 karats, meaning 24 out of 24 parts are gold. When you see a stamp that says 18K, it means 18 parts gold and 6 parts other metals — typically copper, silver, or palladium — giving you 75% gold purity. The math is simple: divide the karat number by 24, then multiply by 100 to get the purity percentage.
Here is how the most common karats break down in both purity and today's live prices per gram:
- 24K (99.9% pure): $152.71 USD | AED 560.84 | SAR 572.67 | EGP 8,051.96 | QAR 555.88 | KWD 46.94
- 22K (91.7% pure): $139.99 USD | AED 514.12 | SAR 524.97 | EGP 7,381.23 | QAR 509.57 | KWD 43.03
- 21K (87.5% pure): $133.62 USD | AED 490.73 | SAR 501.09 | EGP 7,045.46 | QAR 486.39 | KWD 41.08
- 18K (75% pure): $114.53 USD | AED 420.63 | SAR 429.51 | EGP 6,038.97 | QAR 416.91 | KWD 35.21
21K is the dominant karat across Egypt and much of the Gulf for everyday jewelry. 22K is common for traditional Gulf wedding jewelry and Indian-style pieces. 18K is widely used in Italian-style and designer jewelry sold in UAE and Qatar. 24K is primarily for investment bars, coins, and some Chinese-style jewelry.
Beyond the karat number, you will encounter a parallel European stamping system expressed in parts per thousand. 999 means 24K. 916 means 22K. 875 means 21K. 750 means 18K. If you see a three-digit number stamped on a piece alongside or instead of a karat mark, this is what it refers to. Both systems are legally recognized and widely used across GCC hallmarking standards.
One critical detail: in the UAE, the Dubai Central Laboratory (DCL) mandates that all gold jewelry sold must carry a government hallmark in addition to the manufacturer's karat stamp. This hallmark is a small cartouche that includes the karat, the year of testing, and a unique DCL code. If a piece sold in the UAE lacks this mark entirely, that is a serious red flag — not a minor paperwork issue.
How to Read Hallmarks Physically on the Jewelry
Hallmarks are almost always stamped in locations designed to be discreet but findable. On rings, check the inner band. On bracelets, look at the clasp or a link near the clasp. On necklaces, check near the clasp mechanism. On earrings, look at the post or the back of the stud. On pendants, check the bail — the small loop through which the chain passes.
You will typically need a jeweler's loupe — a small magnifying glass of 10x magnification — to read these stamps clearly. A smartphone camera zoomed to maximum and held steady can substitute in decent lighting, though a loupe remains the more reliable tool. Loupes cost between AED 20–50 in most souks and are worth having if you buy gold regularly.
What you are looking for specifically:
- The karat or fineness mark — the number itself (18K, 750, 21K, 875, etc.)
- The maker's mark — a symbol or initials identifying the manufacturer or brand
- The assay or government hallmark — in UAE this is the DCL mark; in Saudi Arabia look for the Saudi Standards, Metrology and Quality Organization (SASO) mark; in Egypt, the Bureau of Mines and Quarries assay mark
- The date letter — used in some European and UK systems to identify the year of hallmarking
If a piece has only a maker's mark and no independent assay hallmark, you are relying entirely on the manufacturer's self-declaration. This is legal in some contexts but offers you less protection. In high-value purchases — anything above EGP 50,000 or AED 5,000 — insisting on a certified assay hallmark is not being difficult; it is being prudent.
Counterfeit stamps do exist, particularly on pieces imported informally. A stamped "22K" means nothing if the stamp was applied with a forged die. This is precisely why the physical tests below matter alongside reading the stamp.
The Magnet Test, Density Check, and Acid Test — What Works and What Doesn't
The magnet test is the most accessible first-pass check you can perform anywhere. Gold is not magnetic. Hold a strong neodymium magnet — the kind used in phone mounts or available cheaply in hardware stores — near the piece. If the jewelry is visibly attracted to the magnet and moves toward it, it contains ferrous metals (iron-based alloys), which means it is definitely not genuine gold. However, a piece that does not attract to a magnet is not automatically confirmed as gold. Copper, brass, and aluminum are also non-magnetic and are commonly used in gold-plated fakes. The magnet test eliminates obvious fakes; it does not confirm genuine gold.
The skin discoloration test is slow but telling. Genuine gold at 18K or higher will not discolor your skin under normal conditions. If a piece leaves green or black marks on your skin after extended wear, it almost certainly has a high copper content, suggesting it is gold-filled, gold-plated, or a low-karat alloy misrepresented at a higher karat. Sweat accelerates this reaction, so a ring worn for a day in humid Gulf summer weather will reveal itself quickly if it is not what it claims.
The density test requires a precise digital scale and a container of water. Gold has a specific gravity of approximately 19.3 g/cm³ — much denser than most metals used in fakes. Weigh the piece in air, then suspend it submerged in water (tied to the scale with thin thread) and weigh it again. The difference gives you the volume displaced, and dividing the dry weight by that volume gives you density. Values between 17–19.3 suggest high-karat gold (lower end accounts for alloying metals). Values below 14 strongly suggest the piece is not gold. This test requires some care to do accurately but is genuinely reliable.
Acid testing kits are the most definitive at-home method. They contain nitric acid solutions calibrated for different karats. You rub a small portion of the piece on a black testing stone to leave a streak of metal, then apply the relevant acid. 18K acid applied to a genuine 18K streak will not dissolve it; applied to a lower-karat or base metal streak, it will fizz and discolor. Kits cost between SAR 80–150 or AED 80–120 from jewelry supply shops. The limitation: acid testing leaves a tiny mark on the piece, so most buyers use it on inconspicuous areas. Professional jewelers perform this routinely.
What definitively settles the question is an XRF (X-ray fluorescence) spectrometer reading, which most licensed jewelry shops and all assay offices can perform. In the UAE, Dubai Municipality assay offices offer this service. In Egypt, the Bureau of Mines and Quarries assay offices provide certified testing for a nominal fee. This is the only method that gives you a precise elemental breakdown of exactly what the piece contains.
What to Check Before You Buy: A Pre-Purchase Protocol
Before any gold purchase, run through this sequence — it takes under five minutes and can save you thousands:
Step 1 — Verify the live price benchmark. Know what the metal itself is worth per gram at that karat today. At the time of writing, 21K gold is EGP 7,045.46 per gram in Egypt and AED 490.73 in the UAE. Any price significantly below this for new jewelry without explanation should make you pause, not celebrate.
Step 2 — Find and read the hallmark with a loupe. Confirm the karat stamp, the assay mark, and the maker's mark are all present. Ask the seller to identify each mark if you are unsure — a reputable seller will explain without hesitation.
Step 3 — Run the magnet test on the spot. Carry a small neodymium magnet. Apply it briefly to the piece. Non-attraction eliminates obvious fakes. This takes four seconds.
Step 4 — Ask for the weight on a calibrated scale. The price should be weight × current gold price per gram at that karat + a declared making charge. If the seller cannot or will not break down the price this way, that opacity is itself informative.
Step 5 — For purchases above a meaningful threshold, request an assay certificate or take the piece to an assay office before finalizing payment. Many reputable UAE and Saudi jewelers will allow this for high-value purchases. Any refusal to permit independent verification before purchase is a dealbreaker.
The making charge — the workmanship premium charged above raw metal value — is a legitimate cost and varies widely by design complexity, brand, and market. In Egypt it typically ranges from EGP 500–2,500 per gram for handcrafted pieces. In the UAE it can range from AED 15–100 per gram depending on the jeweler and design. Knowing the current metal price per gram means you can have an intelligent conversation about what portion of what you are paying is for the gold itself versus the craftsmanship.
Frequently Asked Questions
Q: What does a 916 stamp on gold jewelry mean?
A 916 stamp means the piece is 91.6% pure gold, which corresponds to 22 karats. This is a common marking on gold jewelry manufactured in India and widely sold across the Gulf. At today's prices, 22K gold is worth $139.99 per gram or AED 514.12 per gram.
Q: Can gold-plated jewelry pass the magnet test?
Yes, it can — if the base metal beneath the gold plating is non-magnetic (such as brass, copper, or aluminum). The magnet test only eliminates iron-based fakes. Gold-plated pieces over non-magnetic bases require the density test, acid test, or XRF analysis to identify accurately.
Q: Is 21K gold purity considered good quality for jewelry?
21K is 87.5% pure gold and is the standard jewelry karat across Egypt and widely used in Gulf countries. It offers a strong balance of gold content and durability — pure 24K gold is too soft for most wearable jewelry and scratches easily. At today's price of EGP 7,045.46 per gram, 21K remains excellent value for high-purity wearable pieces.
Q: How do I know if I'm being charged the right price for gold jewelry?
Divide the total price by the weight in grams, then compare that per-gram figure against the current live price for that karat. The difference between your per-gram cost and the spot price is your effective making charge. If that making charge exceeds what local competitors charge for similar designs without a clear reason (brand premium, intricate craftsmanship), you are likely overpaying.
Q: Does the UAE government regulate gold hallmarking strictly?
Yes. The Dubai Central Laboratory (DCL) under Dubai Municipality mandates compulsory hallmarking for all gold jewelry sold in Dubai, and similar frameworks apply across UAE emirates. Retailers are legally required to have jewelry independently assayed and hallmarked before sale. If you purchase a piece in a licensed UAE jewelry store without a DCL hallmark, the retailer is in violation of local regulations — a fact you can report to consumer protection authorities.
For live gold prices updated in real time across all karats and currencies including AED, SAR, EGP, QAR, and KWD, visit DahabPulse.com. The site's gold calculator lets you enter any weight and karat to get the exact metal value at current spot prices — useful both before buying and when selling or appraising pieces you already own.