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London Assay

Goldsmiths Hall
Gutter Lane
EC2V 8AQ London,  Greater London,  United Kingdom


London Assay Office are Supplier Partners to The Guild of Jewellery Designers and are proud to offer members of the GoJD either a 20% discount on a punch & laser registration (dual methods), OR a free laser-only hallmarking registration. Take advantage of these offers by entering either code at the payment stage when registering at www.assayofficelondon.co.uk/registration.


Please note that the subscribing Gold member discount code can be found in members' GoJD account area. Offers As a member of GoJD, register with the Goldsmiths’ Company Assay Office and benefit from:

Access to the Goldsmiths’ Library – 10,000 books, 15,000 images, archives, files, periodicals and journals all related to aspects of gold and silversmithing. Contact the.library@thegoldsmiths.co.uk to book your appointment.


A tour of the Assay Office. Details will be given about arranging it in your welcome pack, once registered. · 20% discount on any Goldsmiths’ Company Assay Office events.


Please state your Gold membership of GoJD number when booking these events. · Downloadable badge within your online account for your website. · Access to all GCAO services.


Quality of mark


The leopard’s head mark of London has been used by some of the finest craftsman in history and continues to be the mark of quality for many of the leading jewellers and silversmiths today.


In order to retain this quality, we regularly employ apprentices who receive four years specialist training before becoming skilled in the art of assaying and hallmarking.


The combined experience of our team is the keystone of our expertise and professionalism. We use the most modern and advanced equipment and technology that is available, not only to apply our laser hallmarks but to manufacture the finest quality punches used for traditional marking.





Laser hallmark, date letter K dates from 2009


Quality of service


Helping the customer lies at the heart of everything that we do and we have always tried to respond to the changing needs of the trade.


Today, we are conscious that quality, speed and flexibility of services are a high priority. As well as operating over four sites, we also offer four different levels of service to help you achieve your lead times.


Our digital portfolio includes online registration, packet tracking, packet payment and email and text alerts letting you know when your work is ready.


We also keep you updated with all the news and events through our e-newsletter and social media sites, and can provide point of sale material to help you market your product.


Quality of support


Being part of the Goldsmiths’ Company means we are dedicated to supporting the trade, students, graduates, and the public by providing educational lectures and tours, workshops and training. You will also often hear about us going on the road to schools and colleges to talk about the importance of hallmarking.


We realise that some people may find hallmarking a little daunting at first, so we offer a complimentary behind the scenes tour for every new customer to give you a better understanding.


Furthermore, we offer a range of other services, all designed to help the trade in different ways - and each delivered with quality. We offer Valuations, Laser Engraving, Laboratory Services, Photography Services, Antique Plate Committee, Assistance to Trading Standards, Punch Making, assistance with Tracing Hallmarks, Lectures and Tours.





Hallmarking a bowl with a straight neck punch



Taking scrapings from silver articles for assaying

Our History


The Goldsmiths’ Company Assay Office is where hallmarking began, and we have been testing and hallmarking precious metals for over 700 years. Our reputation for excellence in hallmarking, service, and support is both revered and unparalleled.



Goldsmiths Company London Assay Office, Goldsmiths Hall

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