Just a quick note to say thank you for all your help in getting my pieces hallmarked. I picked them up today and they look great.

As a beginner at all of this it's been really helpful to have you all guide me through the process.

Thanks again!

Rebecca McIntyre
Rebecca McIntyre

We have been using the Sheffield Assay office for some 20 years now and that's testament to the fact that we have always been given a first class service by Ashley, Danny and the team. Very dependable and reasonably priced. Highly recommended.


We send every week and it’s always a quick turnaround and great service. Staff are able to help with special requests. Very friendly team.

Hannah Leigh

I contacted the Sheffield Assay Office to ask for some help with my JET Diploma course with the hallmarking module and asked them for information in regards to the Bradbury’s book of hallmarks.
I spoke to Ashley Carson, the Assay Master/Chief Executive who was more than helpful and went above and beyond my enquiry. He has over 40 years of experience and certainly knows his stuff.
It was thanks to his fantastic support I decided I will be visiting the Sheffield Assay office to attend one of their tours once they are reopen from lockdown restrictions.
Thank you very much again!!
5 stars!!!

Stephen Allen-Mitchell
Stephen Allen-Mitchell

Great service, we at Goldworkshop Doncaster have been using Sheffield assay office for over 30 years,a credit to Ashley and his team, big thanks from us, Peter.

Pete Taylor

Fantastic staff and service from the Sheffield Assay office. The staff go over and above to accommodate you and your requirements. Nothing is to much trouble, i can highly recommended the services of this Assay office. Well done guys

Michelle French

Always given a first class service. Having used their hallmarking services for over 10 years we have nothing but praise for their customer service, communication, speed , helpfulness and stamping.
We would highly recommend using them.
Andy, Chloe and the progress team do a fantastic job.

Dee Summers

The Sheffield Assay Office provides a fast and efficient service especially their Laser Engraving service...I have used it on many occasions with excellent results and a very speedy turn around. I would recommend their services.

Suzi Kowalski
Suzi Kowalski

Ashley and his team are the consummate professionals. As a new luxury brand, Chelsea Rocks Laboratory Grown Diamonds is extremely appreciative of the warm welcome the Sheffield Assay Office has afforded us and the expediency of our business success. Thank you!

Joanna Park-Tongs

I highly recommend the Sheffield Assay Office after having had 5 star service. Made to feel very welcome and an interesting insight into the history of the company. Thank you so much Ashley

Kath Hall
Kath Hall

I have had my work assayed at Sheffield for over twenty years, and throughout they have been amazing. Brilliant service, and very helpful with any questions or problems. I’d like to send a huge thank you to you all!

Rachel Bailey

If everyone was as friendly, kind and efficient as Ashley Carson, the world would certainly be a better place.
Less than a week since I raised a hallmarking query, my beautiful ring has been hallmarked and returned to me. The service received has been brilliant all round, definitely above and beyond what I expected.
Thank you Ashley for your excellent and speedy service. Super work!

Jennifer Thompson
Jennifer Thompson

I sent my silver cutlery jewellery in to have change of use and what a brilliant service Ashley and his team give. Ashley was so helpful and kind my work was back within 1 week how efficient is that! Thankyou so much to you all will be sending more in soon.

Victoria Luty

I just wanted to say thank you. I dropped my last Christmas commission in on Monday 12th December, thoroughly expecting it to take 5-7 working days considering the time of year, and how everyone seems to be ill at the moment. I got a text to say that it was ready to collect 3.5 days later. I regularly see my jewellery colleagues in online forums complaining about the service, accessibility and sometimes quality at London (and occasionally Birmingham), so it’s brilliant to receive such fab service from you. Just thought I’d say- please share my thanks with the team.

Frances Greenwood

We always look forward to phoning Sheffield Assay Office as we know we will be greeted by someone friendly, knowledgeable and positive. We think these are great attributes especially during recent months when it has been tough in the industry.
The team at SAO are just incredible, to mention just a few: Andy, Danny and Chloe. They are always super helpful, accommodating and organised.
From start to finish the operation runs smoothly and we are very happy with the assaying/hallmarking processes, we could not fault the service and long may it continue.

All at Mark Milton

I wanted to email you to express how delighted I am with your teams extra service.

We had a parcel sent to you on Wednesday via royal mail but it didn't arrive with you until today. One of the rings inside the parcel was for a client that is leaving for Monaco tonight to propose whilst away (he left it late!).

Our client is due to pick up the ring from us this afternoon. After chatting to Andy in progress, he acted instantly and had the ring in his hand and said it would be marked by 2pm. Brilliant!

We were then going to arrange a bike to collect it but after speaking to our delightful client it just so happened to be just north of Sheffield, so would be passing you on route to us. Another quick call to Andy and arranged for our client to pick the ring mount up from you (with passport ID and at our risk), and bring it to us.

I emailed progress with all his contact details and told my client to get to you for 2pm. I then received a reply form Chloe asking me to tell my client to ask for her at the counter. Then to my surprise I got another email form Chloe an hour later saying my client had collected the ring. The client has sat with my setter watching his ring being made and has just left with a huge smile on his face!

If only all service in our trade was as slick as this. This exceeds everything I have experienced in 18 years in the trade. The jewellery trade is slow at the moment as we all know and for our key supplier and client to work with us like this is simply amazing.

This is an £8k sale. You team didn't even know the value, it could have been £500, but they acted like I was the only client you have.

Hats off to Chloe and Andy. Absolutely amazing and they deserve a huge pat on the back!

Luke Billing

Handcrafted from vintage or antique hallmarked solid silver spoons dating from the 1700s to the 1960s, each of our pieces is lovingly handcrafted at our workshop in North Wales.

Jaspersparkle silver spoon rings each have their original historic hallmark visible, we are very proud to be able to give the silver spoons a new lease of life, honouring tradition and giving the customer a unique handmade piece.

Each item is then authorised by the Sheffield Assay Office to ensure we are working to the requirements of the Hallmarking Act.

We have submitted over 250 unique articles to the Sheffield Assay Office this year, for Change of Use authorisation. Thank you so much for your efforts this year. The latest batch of silver and certificates arrived this morning and we're so pleased with the work. Thank you, it's lovely to have the hallmarks identified and even the weight added to the certificates.

Ann Arkle

Sheffield Assay Office has been a great support for us in recent weeks and the staff at your facility have been very collaborative and a pleasure to deal with as usual.

We are re-launching a key product range to our business, Calgitrol(r), which is a medical device product used in the treatment of chronic wounds for very ill patients. Through the re-launch of this product range we have to re-validate the processes of which there are 3 product categories Askina(r) Calgitrol(r) Ag, Askina(r) Calgitrol(r) THIN and Askina(r) Calgitrol(r) Paste.

The key advantage of the product range in the marketplace is it's ionic silver alginate matrix which provides for broad anti-microbial effectiveness and helps prevent contamination from external bacteria.

To this end how Sheffield Assay support us is in testing our products for levels of a key ingredient, silver, in our manufacturing processes. With your prompt turnaround on testing it has supported us in completing process validations and initiating sterilization validations (3 batches of 51 samples per batch for all 3 products in the range). Meeting our site timelines further supports us in submissions for regulatory review.

We look forward to a continuation of a great working relationship and to keeping you busy in the coming months.

Mary Foye
B Braun Hospicare Limited

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