How Fire Assay Testing Works – The Gold Standard of Purity Checking - Precise Gold Lab

How Fire Assay Testing Works – The Gold Standard of Purity Checking

By PreciseLab May 23, 2025 0 263

When it comes to accurate gold purity testing, Fire Assay, also known as the Cupellation Method, is the most trusted and time-tested technique in the world. Used for centuries, it remains the gold standard in the precious metals industry.

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Why Is It So Reliable?

What Is Fire Assay?

Fire Assay is a laboratory process that involves melting gold at high temperatures to separate it from impurities like silver, copper, or other metals. The result is a precise reading of the gold content in a sample—typically accurate to within 0.01%.

High Accuracy : It’s more precise than acid tests or electronic methods.

Trusted Worldwide: Fire Assay is recognized by international gold dealers, refiners, and jewelers.

Used for Certification: Many official gold certificates are based on fire assay results.

⚙️ The Basic Process:

Weighing the Sample – The gold item is carefully measured.

Melting & Cupellation – It is melted in a furnace with lead, which absorbs impurities.

Separation – Gold is isolated in a special cupel, leaving behind pure metal.

Final Weighing – The remaining pure gold is weighed to determine exact purity.

🏢 Where to Get Fire Assay Testing in Dubai?

At Precise Gold Testing Laboratory in the Regal Sky Gold & Jewelry Building, Deira, we offer certified fire assay services with professional reports, fast turnaround, and complete transparency.

Whether you’re dealing with jewelry, coins, bullion, or raw gold—Fire Assay gives you results you can trust.