Before a gold jewellery article is hallmarked, its purity must be accurately determined to ensure it meets the declared fineness standards prescribed by the Bureau of Indian Standards (BIS).
At NCH Services Pvt. Ltd., we assist jewellers with reliable purity assessment using industry-approved testing methods. These testing processes help verify the metal composition, maintain quality standards, and ensure compliance before hallmarking.
Gold Purity Testing
Types of Gold Purity Testing
- XRF Testing (X-Ray Fluorescence)
Fast, Non-Destructive Gold Purity Analysis
X-Ray Fluorescence (XRF) is one of the most advanced methods for determining the elemental composition of gold jewellery. The jewellery is placed inside the XRF analyzer, where X-rays are used to identify the percentage of gold and other alloying metals such as silver, copper, zinc, and nickel.
Key Features
- Non-destructive testing with no damage to jewellery
- Results available within a few seconds
- High accuracy for routine quality checks
- Suitable for finished jewellery and ornaments
- Detects multiple elements simultaneously
- Ideal for retail stores, manufacturers, and hallmarking centres
2.Fire Assay Testing
The International Benchmark for Gold Purity Determination
Fire Assay is regarded as the most accurate method for measuring gold purity. A small sample is taken from the jewellery and processed through high-temperature fusion and chemical separation to determine the exact gold content.This method is widely accepted by laboratories and is used as the reference technique for precious metal analysis.
Key Features
- Extremely high accuracy
- Internationally recognized testing method
- Suitable for precise purity determination
- Ideal for laboratory verification and dispute resolution
- Used for calibration and quality assurance