Welcome to Leiser & Co

Based in Hatton Garden, London, Leiser & Co offers an array of diamond trading services to businesses, private individuals and investors around the world. We are experts in the fields of diamond buying, selling, grading and custom design. We believe in great customer satisfaction and service of the highest level, and strive our best to deliver it.

Please feel free to take a look around the site. If there is anything we can help you with, don’t hesitate to contact us: we are sure to be properly equipped to answer any questions you might have. Learn more about us.

Buying & Selling Diamonds in London

Our expertise in precious gemstones market valuations allows us to offer our clients extremely competitive prices when they both buy or sell diamonds. Our large turnover and many business contacts allows us to find the proper buyer for you at the right price. For this reason, you can sell your diamonds with confidence that you will receive the best possible payout.

Experts in Both Uncertified & Certified Diamonds

We specialize in certified diamonds by the most trusted diamond grading companies in the world. Some of them for example include: GIA, HRD and IGI.

We are also GIA-certified graders with three generations of experience passed along in the field, but we both buy and sell diamonds that do not have certificates as well. Should you desire, we also deal with other certificate types on request as well.

Specialised in Custom Work & Bespoke Engagement Rings

We work with casters, goldsmiths and designers directly, and are able to create any custom model our clients desire. If you would like to get a quote for a price on a custom item of jewellery, please don't hesitate to contact us, whether it is men's rings, engagement rings, necklaces, pendants, bracelets or anything else we are sure to be able to create your custom piece with a finish of the highest perfection.

Free Appraisals

We will gladly offer free appraisals for any of your enquiries.

Request a Quote

Please note that meeting us in our London office is possible by appointment only. To schedule an appointment, feel free to call us or contact us by e-mail.

Certificates we deal in are: GIA, HRD and GIA