Sigma Metalytics vs Acid Test vs XRF: The Ultimate Gold Testing Comparison for UAE Businesses
Sigma Metalytics, acid testing, or XRF analyzer — which gold testing method is right for your UAE or Saudi Arabia business? The complete, honest comparison from Telos Instruments, your authorized GCC testing instrument supplier.
The Question Every Gold Business in the UAE Eventually Has to Answer
Walk into any serious gold trading business, bullion dealership, jewelry shop, pawnshop, or refinery across Dubai, Abu Dhabi, Riyadh, or Jeddah, and behind the counter you will find some kind of gold testing instrument. But which one? And is it the right one for the job?
The precious metals testing market in the UAE and GCC has evolved considerably. A decade ago, most gold businesses relied on acid testing alone. Then XRF analyzers entered the market and became the prestige tool for serious professionals. More recently, Sigma Metalytics Precious Metal Verifiers have entered the GCC market — offering a fundamentally different testing technology that solves problems neither acid testing nor XRF can address.
This blog is the definitive, honest comparison of all three — written by Telos Instruments, the authorized UAE distributor of both Sigma Metalytics precious metal verifiers and Terra Scientific XRF analyzers, so you can trust that what follows is genuinely unbiased. We sell all three technologies. Our job is to help you choose the right one — or the right combination — for your specific operation.
Method 1: Acid Testing — The Original Gold Test
Works by applying nitric acid to a scratch on the gold. The reaction indicates approximate karat. Used for generations in the GCC gold trade.
- Low upfront cost
- Destructive — leaves permanent scratch
- Hazardous chemicals required
- Approximate results only
- Tests surface only — misses cores
- Cannot test through packaging
- No digital documentation
Method 2: XRF Analysis — The Laboratory Standard
Uses X-rays to determine exact elemental composition. Provides precise gold percentage and full alloy breakdown. Gold standard for jewelry, refineries, and compliance.
- Precise % composition — to 0.01%
- Full elemental breakdown — 28+ elements
- Tests jewelry — all shapes and sizes
- Fully non-destructive
- Full digital documentation
- GLP and ESMA compliant records
- Tests surface only — misses cores
- Cannot test through packaging
Method 3: Sigma Metalytics PMV — The Bullion Specialist
Uses electromagnetic resistivity to read the bulk metal all the way through coins and bars. Detects tungsten cores and internal fraud that XRF misses.
- Tests bulk metal — full thickness
- Detects tungsten cores and internal fraud
- Tests through sealed packaging
- Under 1 second per test
- No chemicals, no consumables
- Trusted by Perth Mint and central banks
- Bullion coins and bars only — not jewelry
- No elemental % breakdown
Head-to-Head Comparison: All Three Methods
| Feature | Acid Test | XRF Analyzer | Sigma Metalytics PMV |
|---|---|---|---|
| Tests bulk metal | ❌ Surface only | ❌ Surface only | ✅ Full thickness |
| Tests through packaging | ❌ No | ❌ No | ✅ Yes |
| Detects tungsten core | ❌ No | ❌ No | ✅ Yes |
| Tests jewelry | ✅ Yes | ✅ Yes | ❌ No |
| Precise % composition | ❌ Approx only | ✅ Yes | ❌ No |
| Full elemental breakdown | ❌ No | ✅ Yes | ❌ No |
| Non-destructive | ❌ Leaves scratch | ✅ Yes | ✅ Yes |
| Chemicals required | ❌ Yes | ✅ None | ✅ None |
| Compliance documentation | ❌ No | ✅ Yes | ❌ No |
| Speed | 2–5 min | 5–60 sec | <1 sec |
| Used by Perth Mint | ❌ No | ✅ Yes | ✅ Yes |
Scenario-Based Guide: Which Method for Which Situation?
A Dubai coin dealer needs to verify 50 sealed Krugerrands without opening the packaging.
✅ Sigma Metalytics PMV PROA Jeddah jewelry retailer needs exact gold percentage and alloy content for pricing and compliance.
✅ Terra Scientific Aurora 900 XRFAn Abu Dhabi bullion trader needs to check for tungsten core and verify authenticity.
✅ Sigma Metalytics PMV PRO + Adam Equipment BalanceA Dubai refinery needs precise gold percentage and full alloy breakdown to calculate melt value.
✅ Terra Scientific XRFA Riyadh pawnshop handles both coins/bars and jewelry. Needs authentication across all types.
✅ Sigma Metalytics + GemOro AuRACLE PROA Kuwait investor wants to verify personal coin and bar holdings at home.
✅ Sigma Metalytics PMV InvestorFrequently Asked Questions
Can I use the Sigma Metalytics instead of XRF to save money?
They solve different problems and cannot replace each other. The Sigma Metalytics authenticates bulk metal in bullion coins and bars and tests through packaging. XRF provides precise elemental composition, tests jewelry, and produces compliance records. For businesses handling both coins/bars and jewelry, you need both.
Does XRF catch tungsten-core gold bars?
XRF reads the surface of the metal only — typically a few microns to a few millimetres. A gold bar with a tungsten core covered by a genuine gold exterior will read as gold on XRF. The Sigma Metalytics electromagnetic field penetrates the full thickness of the bar, making tungsten core detection reliable and immediate.
Is acid testing still acceptable for a UAE gold business in 2026?
For very basic first-line screening of irregular scrap gold, acid testing retains some utility. For any professional UAE gold business handling meaningful transaction volumes, coins, bars, or items where surface integrity matters — acid testing is inadequate and the UAE and Saudi Arabia markets have moved beyond it.
Can I use one instrument for my entire precious metals operation?
Very few gold businesses handle genuinely uniform inventory. If your operation is exclusively bullion coins and bars, a Sigma Metalytics PMV combined with a precision balance covers your primary authentication needs. If you handle jewelry, you need XRF or the AuRACLE PRO as well. Telos Instruments provides a free consultation.
Which is faster — XRF or Sigma Metalytics?
The Sigma Metalytics delivers results in under one second. XRF analysis typically takes 5 to 60 seconds depending on the testing mode and required precision.
Get the Right Testing Instrument for Your Operation
Free consultation on which testing method or combination is right for your business. Live demonstrations at your premises. Expert guidance from one partner who supplies all three technologies.
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