How to Test and Verify Gold Purity in Dubai
Before buying or after receiving gold as a gift, you may want to verify its purity. This guide covers every method to test gold in Dubai — from hallmark reading to XRF testing, acid tests, and free government testing services.
Why Verifying Gold Purity Matters
Dubai's gold market is well-regulated and hallmark fraud is rare, but it is not unknown — especially with imported jewellery from unregulated markets, online purchases, or inherited gold whose origin is uncertain. Knowing how to verify purity protects your investment.
Method 1: Read the Hallmark (Free, Instant)
The easiest and most reliable first step. All gold sold in Dubai must carry a UAE-approved fineness stamp:
- 999 = 24 karat (99.9% pure)
- 916 = 22 karat (91.6% pure)
- 875 = 21 karat (87.5% pure)
- 750 = 18 karat (75% pure)
- 585 = 14 karat (58.5% pure)
Look for these stamps on clasps, inside ring shanks, on pendant bails, or at bracelet joints. Use a 10x loupe magnifier — ask the shop for one, or buy for AED 20–50 at any stationery shop.
Red flag: no visible stamp, or stamps that say "GP" (gold plated), "GF" (gold filled), or "GE" (gold electroplated) — these indicate non-solid gold.
Method 2: Free XRF Testing at Dubai Municipality
Dubai Municipality operates free gold purity testing services at several locations including the Gold Souk area in Deira. They use XRF (X-ray fluorescence) analysers — handheld devices that shoot X-rays at the gold surface and measure the elemental composition precisely.
XRF testing is:
- Non-destructive — no damage to your jewellery
- Accurate — measures to within 0.1% of actual purity
- Fast — results in 30–60 seconds
- Free — Dubai Municipality service at Gold Souk testing booths
You can also request XRF testing at any licensed gold dealer in the souk — most have their own XRF machines and will test for free if you are considering a purchase.
Method 3: Acid Test (Used by Dealers)
The acid test (also called the touchstone test) is an older method where a tiny scratch of gold is made on a black ceramic stone, then nitric acid (and optionally aqua regia) is applied to the scratch. The colour and reaction of the scratch indicates purity:
- No reaction to nitric acid = 18K+ gold
- Slight reaction = 14K range
- Strong reaction = below 10K or gold plated
This is a destructive test (removes a tiny amount of gold from the surface) and is typically used by dealers, not consumers. You can request a dealer to perform this test if you are uncertain about a piece they are selling.
Method 4: Electronic Gold Testers
Electronic gold testers (available for AED 200–500 online or at electronics shops) use electrical conductivity to estimate gold karat. They are less accurate than XRF but can distinguish between different karats and detect obvious fakes. Useful for personal use if you frequently evaluate gold.
Method 5: Density Test (At Home)
Gold has a very specific density of 19.3 g/cm³. Using a precise scale and a container of water:
- Weigh the gold item in air (W_air)
- Submerge it fully in water and record the weight (W_water)
- Density = W_air ÷ (W_air - W_water)
- Pure gold = ~19.3 g/cm³; 22K = ~17.7 g/cm³; 18K = ~15.5 g/cm³
This method is disrupted by hollow pieces, stones, or complex structures. Use it only for solid plain gold items.
What to Do If Purity Is Wrong
If a purchased item tests lower than its stated karat:
- Return to the shop with the XRF result — legitimate Dubai dealers will exchange or refund without dispute
- If the shop refuses, report to Dubai Municipality's Consumer Protection section — they take hallmark fraud seriously
- For online purchases, the same consumer protection laws apply to UAE-based sellers; for international purchases, recovery is more complex
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