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Our World: Welcome


Marquis is a gemstone and fine art advisory service, specialising in sourcing gemstones to protect wealth.  

Our World: About Us

"I started Marquis to provide an all-encompassing service for your fine art and jewellery needs, whether this is sourcing watches, gemstones and diamonds for your investment portfolio, creating a beautiful bespoke piece of jewellery, redesigning a family heirloom, updating your insurance valuations or finding you the perfect painting that brings you joy."  

"Acting as a central focal point for luxury services in Guernsey, I aim to provide a discrete, tailored service which gifts you the greatest luxury; time." 

"I aim for Marquis to be a vehicle of positive impact, creating a sustainable supply chain and supporting the communities we work with."

- Sophie Marquis

Our World: About


Sophie Marquis grew up in Guernsey and went onto Durham University to read Economics, Art History, Classics and Philosophy.  Following her love of art and antiques to Sotheby's to gain a Masters in Fine and Decorative Art, specialising in Impressionist Paintings and 18th Century British Porcelain.  

Sophie's began her career with roles for art fairs, dealers, artists, the Art & Antiques Unit at the Met and in the Finance sector.  It was working as a specialist at an auction house that she discovered her passion for gemstones seeing them as the perfect combination between art and science, and went into luxury jewellery and watch retail.  She gained her gemmological diploma becoming a Fellow of the Gemmological Association of Great Britain.

In 2017 Sophie went treasure hunting, visiting important gemstone centres.  Highlights include venturing down a tanzanite mine at Merelani, negotiating for spinel and ruby at the Luc Yen gemstone market in Vietnam and panning for padparadscha sapphire in Sri Lanka.  

Contact Sophie on

Our World: About


Member of the National Association of Jewellers

Fellow of the Gemmological Association of Great Britain

Gem-A Affiliate Logos_Individual Member
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Our World: Products
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