Assaying & Purity Testing
Our assaying services go beyond standard hallmarking to provide detailed purity analysis for gold and silver in any form — jewellery, bullion, scrap, or raw material. We offer XRF spectrometry for rapid non-destructive testing and fire assay for definitive, referee-grade analysis. All testing follows calibration protocols aligned with BIS norms and international best practices.
XRF results available within hours. Fire assay results typically within 1–2 working days.
Jewellers needing purity verification, bullion dealers, refiners, banks, and institutions requiring assay certificates.
Articles or samples are tested using XRF spectrometry for non-destructive analysis. Fire assay (cupellation) is available for situations requiring the highest accuracy or for resolving disputes. Results are provided in a detailed assay certificate.
Sample identification details, requested analysis type, and applicable fees. For fire assay, a small sample may need to be cut from the article.
Frequently asked questions
XRF (X-ray fluorescence) spectrometry is a non-destructive method that measures surface composition and provides rapid results within minutes. Fire assay (cupellation) is a destructive, referee-grade method that determines the absolute gold or silver content of a sample. Fire assay is considered the most accurate method and is used when definitive results are required or for dispute resolution.
Our calibrated XRF spectrometers provide accuracy within BIS-specified tolerances for hallmarking purposes. The instruments are regularly calibrated using certified reference materials and undergo periodic proficiency testing to ensure consistent, reliable results.
XRF testing results are typically available within a few hours on the same working day. Fire assay results require 1 to 2 working days due to the multi-step cupellation process involved.
Related articles
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How XRF Testing Works in a Hallmarking Laboratory
An inside look at X-Ray Fluorescence spectrometry — the non-destructive method used to test gold and silver purity.
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Methods for Testing Bullion Purity: Bars, Coins, and Doré
How hallmarking centres test the purity of gold and silver bullion — from XRF screening to fire assay.
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The Importance of Fire Assay in Precious Metal Testing
Why fire assay remains the gold standard for purity analysis — its unmatched accuracy, the four-stage process, and how it complements XRF in modern hallmarking.
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