About us

Marcus McCallum Ltd was established in London’s historical jewellery district of Hatton Garden in 1984. With a strong emphasis on quality, we offer a hand selected choice of one-off gemstones and an extensive selection of pearls. Marcus started in the trade due to a passion for gemstones and gemmology and over the years has built a team of gemmologists and experts in order to fully support the jewellery industry.

We take great pride in our hand-selected range of unique gemstones and extensive collection of pearls. Our stock is personally sourced from around the world and through regular trips to gemstone-producing regions, we have established strong global connections, allowing us to present you with a diverse and exceptional selection.

Meet the team


Since finding a fossil sea urchin on our drive at the age of 6, I have always loved minerals and fossils and spent many happy hours scouring the countryside as a child!

I was very fortunate to get a wonderful start in the industry in 1978, working for a gem and mineral dealer called Roughgems. They specialsed in rare stones and were very gemmologically minded and well connected.

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I Joined Marcus in the business in 2001. I have had a varied background mainly in sales and customer services, working in the mobile phone industry before coming to Hatton Garden.

Although not formally trained I have managed to gain experience in all things gemmological with a focus on the fresh water pearl side of the business. I often travel to Hong Kong to source pearls and have also loved travelling with Marcus to Brazil, Sri Lanka and Myanmar to help with buying stones.

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I am a certified F.G.A gemmologist at Marcus McCallum Ltd and a co-director of Adit Fine Minerals. My journey into the world of gemstones began because I was fortunate enough to have Marcus as my uncle.

After exploring various paths in life, I found my calling in the gemstone industry and have never looked back!

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I was born in Belgium but moved to London after my studies in Classics at Oxford University. Having inherited a passion for jewellery from my mum, I decided to enrol on a gemmology course at Gem-A in my free time. I was hooked straight-away, started working with loose gemstones in Hatton Garden and I haven’t looked back since.

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With a strong passion for jewellery and gemstones from a young age, I started working in the trade straight after graduating from a creative arts degree at Manchester School of Art in 2013.

I have previously worked at renowned jewellery boutiques in London along with a smaller independent family run business in Swansea that specialized in pre-owned pieces…

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I moved down from Cheshire in 1996 to study for my degree in Jewellery Design and Silversmithing at the Kent Institute of Art and Design.

I have been with Marcus McCallum for 15+ happy years and have always worked within the trade.

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Percy the Norwich Terrier, joined the team at the age of 12 weeks and has spent many happy days providing security and being the head of “Office Morale”. He can always be relied upon to greet visitors and make them smile.

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