Assay and hallmarking play a vital role in the jewellery industry, especially for precious metals like gold, silver, and platinum. These processes verify the authenticity, quality, and purity of the metals used in jewellery.
In this blog post, we’ll explain what assay and hallmarking involve and why they matter so much in ensuring trust and transparency in the jewellery trade.

What is an assay?
Assay determines the amount and quality of precious metals in an alloy. Experts perform a series of tests to detect impurities and calculate the percentage of pure metal present. Depending on the type of metal, they use either fire assay or instrumental methods to ensure accurate results.
What is hallmarking?
Hallmarking certifies the purity and quality of precious metals used in jewellery. Authorized agencies stamp a hallmark—a symbol or mark—onto the metal to indicate its type and purity. In many countries, laws require hallmarking to protect consumers and ensure transparency in the jewellery market.
The hallmark typically includes the following information:
- Maker’s mark: This is the stamp or symbol that identifies the manufacturer of the jewellery.
- Metal fineness: This is a number that indicates the purity of the metal. For example, in the UK, gold is measured in carats, while in the US, it is measured in karats.
- Assay office mark: This is the stamp or symbol that identifies the assay office where the metal was tested and hallmark stamped.
- Date letter: This is the stamp or symbol that indicates the year that the jewellery was hallmarked.
Why is assay and hallmarking is important?
Assay and hallmarking play a crucial role in the jewellery industry for several reasons. First, they verify the authenticity and quality of the precious metals used, giving consumers confidence that they’re purchasing genuine, high-quality jewellery. Hallmarking also helps prevent fraud and deception by clearly indicating metal purity. In many countries, laws mandate hallmarking to ensure that jewellery meets industry standards and to protect consumer rights.
Assay and hallmarking are vital processes in the jewelry industry, ensuring the authenticity, quality, and purity of precious metals used in jewellery making.
At Mechelec, we recognise the importance of these standards and offer a range of high-quality assay furnaces and hallmarking machines designed for reliable, accurate performance. Our equipment supports manufacturers and jewellers in meeting industry regulations and maintaining consumer trust.
Contact us today to learn more about our products and how we can support your jewellery-making needs with dependable solutions.
Click to know more about the Hallmarking guidelines of Precious Metals