Please note that our Laboratory services are only suitable for metallic, homogenous samples only. We do not assay rocks, ore, sweeps, lemel or dental samples. Our melt and assay service can only be used for broken/scrap jewellery or silverware. Any samples received that do not meet these criteria will be returned to you, at your cost.
Our laboratory provides a unique range of services, from smelting and special assay to nickel testing and antique silver dating. "Special Assay" is an intensive scientific process carried out in a laboratory. It takes a minimum of five working days to complete. If you have a technical query about this service please email customerservice@assayofficelondon.co.uk
Using the most sophisticated modern techniques, state-of-the-art equipment and rigorous procedures - while drawing upon expertise acquired over the centuries - we offer our customers standards of accuracy and reliability that are second to none.
Our laboratory is fully independent. To further underline the quality of our services, we are selected by the Trading Standards Authorities to examine and witness the authenticity of metals.
All Laboratory Services should be submitted to Goldsmith's Hall.
Full costs can be found in our Pricelist found in the Downloads section.
To use this service, you can submit items at Goldsmiths' Hall by post or courier, or in person. This work is then undertaken by our partners in Sheffield.
To keep pace with the evolving needs of the modern jewellery and silversmithing industries, we are constantly developing our portfolio of expert laboratory services.
Special Assay Hallnote
We offer complete compositional analysis of metal alloys: for gold, silver, platinum, palladium and other elements,using X-ray fluorescence spectrometry (XRF).
This will give you a written report of the breakdown of the alloy.
This usually takes 5-10 working days.
Assaying is the analysis of a metal article's composition. This is a destructive test where a physical sample is taken from the piece and tested. We do this using a variety of techniques, some ancient and some modern:
Gold and Silver Assays take typically 5-8 working days.
Platinum and Palladium Assays take between 5-10 working days.
Any Multi-element Assay will be the length of time of the element with the longest timeframe.
Volumetric flasks in the laboratory
Smelting process
Smelting - a comprehensive service for precious metal scrap. We can't accept base metal for smelting. This includes gold plated base metal items.
Scrap Gold and/or Silver can be submitted for smelting, assaying and certification up to 10kg per bar. Platinum and/or Palladium up to 2kg per bar.
Timeframes as mentioned above which include this smelt prior to the certification of the result.
The EU REACH Regulation has been brought into UK law under the European Union (Withdrawal) Act 2018. The key principles of the EU REACH Regulation have been retained. Under the Northern Ireland Protocol the EU REACH Regulation continues to apply to Northern Ireland . This is now know as UK REACH. More information can be found here with the REACH Statutory Instrument found here.
These regulations mean that precious metal items need a high level of protection to human health and the environment from the use of chemicals. There are certain metals within alloys which can cause harm to human health.
Our services below allow you to adhere to this legislation.
Nickel is a well known allergen and as such is subject to the laws set down in UK REACH.
This states that any manufacturer, retailer, importer etc. will commit an offence if they sell or supply post assemblies to be inserted into a pierced part of the human body unless the rate of Nickel release is less than 0.35ug/cm2/week. Similarly, if they sell or supply jewellery items, precious or base metal that come into prolonged contact with the skin unless the rate of Nickel release is less than 0.88ug/cm2/week.
There are no restrictions on the Nickel content that may be in the metal alloy to be supplied.
Nickel testing includes:
The British standard test method requires 3 Articles to prove compliance for that article.
See this Glossary for the definition of article.
Be aware we will carry out the requested test on the submitted items, but too few articles submitted or articles submitted that do not count as the same article may mean the results of the test do not prove REACH compliance. Note will be made of this on the certificate.
The Nickel test is a destructive test where a physical sample is taken from the piece for testing and this sample cannot be returned.
This service takes at least 10 working days.
We do not carry out testing of spectacle frames and sunglasses for nickel release.
The ability to detect lead and cadmium in jewellery items is becoming more important due to the harmful effects that these toxic elements can have. Cadmium and lead are restricted by REACH regulations. Our laboratory provides a lead and cadmium testing service for precious metal and costume jewellery in line with REACH regulations.
Cadmium & Lead – These are considered as toxic metals. The regulations state that items may not be placed on the market if the Cadmium content is equal to or > than 0.01% and if the Lead content is equal to or > 0.05%.
Lead and Cadmium testing - testing for precious metal and costume jewellery in line with REACH regulations.
Lead and Cadmium testing is a destructive test where a physical sample is taken from the piece for testing and this sample cannot be returned.
This service takes at least 10 working days.
