Delhi Gold TestingAGL Laboratory
Metallurgical Integrity & Purity Certification

Gold Testing
& Assaying Laboratory

We employ clinical-grade X-Ray Fluorescence (XRF) scanners and traditional chemical Fire Assay (cupellation) methods to certify the purity of your gold assets. As Delhi's leading gold testing laboratory in Rohini, we guarantee absolute precision for jewelry, bullion, and scrap.

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Macro shot of pure gold bars stacked under bright clinical laboratory lighting

Scientific Assaying Methods

Our gold assaying center Rohini utilizes a comprehensive three-stage testing system to guarantee that every gold specimen is mapped internally and externally.

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XRF Spectrometry

Non-destructive optical scanning that exposes the elemental components (Gold, Silver, Platinum, Palladium, Nickel, Zinc) on the surface of your metal with 0.01% accuracy.

Precision: 0.01% | Time: 120s
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Chemical Fire Assay

The traditional gold standard of purification. A tiny scraping is combined with lead and cupelled at 1050°C, separating pure gold from all base metals to verify Karatage.

Standard: GIA & ISO 11426
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Ultrasonic Core Scans

Advanced sound wave penetration scans the internal density of bullion bars, immediately exposing tungsten core insertions or heavy-metal plating without cutting the bar.

Tungsten Detection: 100%

Gold Karat Purity Standards

KaratageGold PurityParts Per ThousandCommon Applications
24 Karat99.9%999 Fine GoldInvestment bullion bars, sovereign coins
22 Karat91.6%916 GoldTraditional Indian jewelry, bridal ornaments
18 Karat75.0%750 GoldLuxury diamonds, high-end rings and watches
14 Karat58.3%583 GoldDaily wear rings, sturdy earrings, bands

Frequently Asked Questions

Find answers to common queries regarding gold hallmarking, purity certification, and metallurgical testing procedures.

How does Delhi Gold Testing test the purity of gold?

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We perform gold purity scans using a dual-verification system. First, non-destructive X-Ray Fluorescence (XRF) spectrometry analyzes surface elemental compositions. Second, for legal valuation and complete accuracy, we execute Fire Assay cupellation, which completely isolates pure gold by smelting out base metals.

What is the difference between XRF spectrometry and Fire Assay?

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XRF spectrometry is a fast, 100% non-destructive scan that reads surface plating and alloys. However, it cannot penetrate deeply into thick gold bars. Fire Assay is a destructive chemical assaying method that smelt-purifies a tiny scraping of the gold specimen at 1050°C. It is the gold standard for global trading because it tests the core metal purity.

How does your Rohini lab detect tungsten and heavy-metal inserts in gold bars?

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Tungsten has an identical density to gold, meaning standard gravity balances cannot spot it. Our gold testing laboratory in Delhi utilizes advanced Ultrasonic Core Scanners. These propagate high-frequency sound waves through the metal, detecting acoustic mismatches at boundary interfaces created by internal tungsten or lead inserts.

What gold purity standards are tested at AGL?

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We test and certify all standard gold alloy grades, including 24K (999 Fine), 22K (916 Fine), 18K (750 Fine), and 14K (583 Fine) jewelry, bullion coins, raw scrap, and dental gold alloys.

Secure Your Gold Valuation

Ensure your assets are pure. Contact us to schedule an appointment for hallmarking, appraisal, or scrap gold composition scanning at Rohini.

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