Whether you’re buying a bridal set in Deira, receiving a gift, or inheriting a family heirloom, one question always: is this actually gold?
At Thangals Jewellers in Dubai, we’ve spent decades helping customers make confident, informed purchases. Gold fraud is more common than people realise from gold-plated brass sold as solid gold, to low-karat pieces misrepresented as 22K. Knowing how to verify your gold’s authenticity isn’t paranoia. It’s smart buying.
This guide walks you through every reliable method from simple at-home checks to professional testing with honest advice on which tests work best and where their limits lie. Think of it as the practical companion to our complete guide on buying gold jewellery.
Methods at a Glance
Here’s a quick reference before we dive deep into each method:
Method | Difficulty | Accuracy | Risk to Piece |
Hallmark Check | Easy | High | None |
Magnet Test | Easy | Moderate | None |
Float / Water Test | Easy | Moderate | None |
Skin Discolouration | Easy | Low–Moderate | None |
Ceramic Scratch Test | Moderate | Moderate | Minor surface mark |
Acid Test | Advanced | Very High | Minor scratch |
XRF Spectrometry | Professional | Highest | None |
Method 1: Check the Hallmark Stamp
The hallmark is the most straightforward and globally trusted indicator of gold’s authenticity and purity. In the UAE and most countries, legitimate gold jewellery is legally required to carry a purity stamp.
Use a magnifying glass or jeweller’s loupe to find the stamp it’s typically found inside rings, on the clasp of necklaces and bracelets, or on the post of earrings.
What the Numbers Mean (UAE & International
Stamp | Karat | Gold Purity | Common Use |
999 | 24K | 99.9% | Bullion bars, investment gold |
916 | 22K | 91.6% | Bridal & traditional jewellery (UAE favourite) |
875 | 21K | 87.5% | GCC jewellery, everyday wear |
750 | 18K | 75% | Designer & diamond-set jewellery |
585 | 14K | 58.5% | Western markets, durable daily wear |
375 | 9K | 37.5% | UK entry-level jewellery |
Method 2: The Magnet Test
Gold is not magnetic. This makes a strong neodymium magnet (available cheaply online or at hardware stores) a useful first-pass test.
How to do it:
- Hold a strong magnet close to then touching the piece.
- If the jewellery is attracted to or sticks to the magnet it almost certainly contains iron, steel, or another ferrous metal. It is NOT solid gold.
- If it shows no attraction this is encouraging, but not conclusive on its own.
Method 3: The Float / Water Test
Gold is an extremely dense metal it measures 19.3 g/cm³, one of the heaviest metals known. Most fake gold alloys are considerably lighter.
How to do it:
- Fill a glass or bowl with water (no soaps or chemicals).
- Gently drop the jewellery piece in.
- Real gold sinks immediately and decisively to the bottom.
- If the piece floats or hovers mid-water, it is unlikely to be genuine gold.
Method 4: Skin Discolouration Check
Pure and high-karat gold does not react with skin acids or moisture it is chemically inert under normal conditions. Base metals like copper do react, leaving marks.
How to do it:
- Clean your skin and the jewellery piece.
- Hold the piece firmly against your inner arm or palm for a few minutes.
- Real gold (18K and above) leaves no discolouration on the skin.
- Green or black marks strongly suggest copper or nickel content a sign of low-karat or fake gold.
Method 5: The Ceramic Scratch Test
This test is best reserved for pieces you’re willing to risk minor surface marks on unfinished areas, clasps, or inside bands.
How to do it:
- Take an unglazed ceramic tile or plate (the rough, unfinished underside works well).
- Gently drag the jewellery across the surface.
- Real gold leaves a gold-coloured streak on the ceramic.
- A black streak indicates pyrite (fool’s gold) or another imitation metal.
Method 6: Acid Test (Nitric Acid)
The acid test is one of the most reliable methods for determining gold purity. It works because gold is resistant to nitric acid, whereas base metals dissolve or discolour rapidly.
How it works:
- A small scratch is made on an inconspicuous area of the piece using a touchstone.
- A drop of nitric acid (or a karat-specific test acid) is applied to the mark.
- No reaction = gold of that karat or higher. Green or milky reaction = base metal, gold-plated, or lower karat than claimed.
Method 7: XRF Spectrometry (Professional Testing)
X-ray fluorescence (XRF) testing is the definitive method for identifying gold purity without touching or damaging the piece. It uses X-rays to excite atoms in the metal and measure the exact elemental composition.
How it works:
- The jewellery is placed in or near the XRF device no chemicals, no scratching.
- Results are returned in seconds, showing the precise percentage of gold, silver, copper, and other elements.
- Accuracy to within 0.1% makes this the gold standard for professional appraisals.
Red Flags When Buying Gold Jewellery
Knowing how to test gold is important but it’s equally valuable to know what warning signs to watch for before you buy. Our experienced team at Thangals has seen every trick in the book.
The “Too Good to Be True” Rule
Gold prices are publicly traded and globally transparent. If you’re offered 22K gold significantly below the day’s Dubai Gold Rate, that’s a serious warning sign. Check the current Dubai Gold Rate before any purchase and use it as your baseline.
Tourist Trap Awareness in Dubai
Dubai’s Gold Souk is among the world’s most legitimate and regulated gold markets. However, smaller informal sellers around tourist areas occasionally operate outside standard regulations. Always buy from a shop that displays its trade licence and is registered with the Dubai Gold & Jewellery Group (DGJG).
The Bottom Line: Trust, but Verify
The methods above form a layered defence strategy. No single at-home test is foolproof but combining hallmark inspection + magnet test + float test will give you strong confidence before a purchase. For high-value pieces bridal sets, investment jewellery, or inherited pieces you’re considering reselling, always invest in a professional acid test or XRF analysis.
At Thangals Jewellers in Dubai, every piece we sell is hallmarked, purity-verified, and accompanied by documentation. Our team is always available to test any piece whether purchased from us or elsewhere so you can buy and own your gold with complete peace of mind.
About This Guide
Written by: Thangals Jewellery Expert Team Certified Jewellers, Dubai, UAE
This guide was researched and written by the gemology and jewellery advisory team at Thangals, drawing on decades of hands-on experience in Dubai’s gold jewellery trade. Our recommendations reflect industry-standard practices, UAE regulatory requirements, and real-world buying scenarios we see in our store every day.
