Katharina Anna Thomas is a Rotterdam-based contemporary art jeweller. Her practice begins where the workshop ends — with the off-cut, the residue, the fragment that the fabrication economy would dismiss as waste.
The first piece came from a bucket. For years, while working as a model maker and fabricator, she would hang the mixing tool above a bucket after each casting. Drops of pigmented resin fell, layer upon layer, until a sediment had built — fifteen centimetres of accumulated castings, a totem of every project that had passed through her hands. She lifted it out and shaped it into a ring: every commission, every collaboration, every colour, condensed into a single object held by the body.
This remains the conceptual foundation of her work. Each piece begins with a fragment selected by attention. The shaping takes around three hours of grinding, followed by up to two hours of sanding and polishing. Once she begins, she does not stop. What enters the form during those hours is a diffuse field — the energy of the day, the colour of the block in her hand, what runs through the body and what arrives from outside it. The piece is finished when proportion, tension, and balance arrive together, when the form sits on the finger as if it had always been there.
Her work occupies a territory between the conceptual and the sensual. The forms are biomorphic and tactile — shaped rather than designed, holding colour and translucency in proportions that feel close to the body. They form a symbiosis with the hand rather than decorating it. At the same time, each piece carries a quiet proposition: that the disregarded fragment, shaped with care, holds a history worth recognising — that value is a function of attention, not of origin.
Trained as an architect in Kassel and Istanbul, Thomas worked for years in high-precision model making and sculptural fabrication — at Erginoğlu & Çalışlar Architects in Istanbul, and later at Vincent de Rijk Werkplaats and Odd Matter Studio in Rotterdam — before founding STUDIOTRAFO during the pandemic. The name comes from transformation: not as metaphor, but as method.
Her current project, On Site, extends this inquiry into site-specific jewelry — pieces made in response to particular places, carrying the memory of where they were made.
Recent recognition includes the Legnica Jewellery Festival SILVER (2025), a feature in Lost in Jewellery Magazine. In 2025, she received the Stimuleringsfonds Open Call Professionalisation grant to further develop her practice in contemporary art jewelry, alongside support from Het Cultuurfonds for On Site.
