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Our History

A Legacy of Exquisite Antique Jewellery and Trophy Coloured Gemstones at Katherine James Jewellery

At KJJ, our commitment to excellence is woven into the very fabric of our history. With decades of experience in curating exquisite antique jewellery and sourcing trophy coloured gemstones for clients all over the world, we have earned a reputation for craftsmanship, sophistication, and timeless excellence. Our rich heritage and legacy of luxury that defines Katherine James Jewellery, had shaped our Lab Grown Diamond Department, where history meets brilliance and sustainability in every sparkling gem. As a sister site to, here at KJJ.Diamonds we bring all our experience to bear, specialising in exquisite lab-grown diamonds that redefine luxury with their ethical origins, exceptional beauty, and extraordinary craftsmanship.

A Legacy of Excellence

Katherine James Jewellery has always been synonymous with luxury and refinement. Our journey began with a passion for antique jewellery—a love affair with the timeless beauty and intricate craftsmanship of bygone eras, and a passion for unique statement gemstones. Over the years, we have curated an exceptional collection of antique pieces, and set some of Londons most extraordinary gems with unparalleled quality.

Curating Exquisite Antique Jewellery

Our collection of antique jewellery reflects the elegance and sophistication of centuries past. From Art Deco engagement rings to Victorian-era brooches and Georgian necklaces, each piece tells a story. With our keen eye for craftsmanship and attention to detail, we hand-select only the finest antique pieces to add to our curated collection, ensuring that each piece is a true work of art.

Sourcing Trophy Coloured Gemstones

In addition to our passion for antique jewellery, we are also renowned for our expertise in sourcing trophy coloured gemstones. From rare Kashmir sapphires to vibrant Colombian emeralds and fiery Burmese rubies, we source only the most exceptional gemstones to add to our collection. Each gemstone is meticulously graded for quality, colour, and clarity, ensuring that only the most exquisite specimens make their way into our designs.

Decades of Experience

With decades of experience in the jewellery industry, our team brings a wealth of knowledge, expertise, and passion to every aspect of our business. From our skilled craftsmen and designers to our dedicated gemologists and curators, each member of the KJJ team is committed to upholding our legacy of excellence and craftsmanship as we embrace Lab Grown Diamonds.

Continuing the Tradition

As we look to the future, we remain dedicated to continuing the tradition of excellence that has defined KJJ. Whether curating antique jewellery, sourcing trophy coloured gemstones, or creating bespoke designs in Lab Grown Diamonds, we are committed to providing our clients with the highest level of quality, sophistication, and service.

Experience the legacy of luxury, with our rich history in exquisite antique jewellery, unparalleled expertise in coloured gemstones, and decades of experience in the industry, we are proud to uphold the tradition of excellence that has defined our brand. Shop our collection today and discover the quality of the KJJ Diamond Department.