Fraunhofer Center for Assistive Information and Communication Solutions – AICOS
04.12.2025
Imprensa Nacional – Casa da Moeda (INCM) has long been a trusted partner of Fraunhofer Portugal AICOS, and together they are once again advancing innovation — this time in the assay and hallmarking sector — with the Uniquemark® solution.
Uniquemark® merges centuries-old hallmarking traditions with state-of-the-art technology. Building on the promising results of the original initiative – promoted by the Assay Office, the national authority responsible for certifying precious metal items – this new phase focuses on refining a novel marking technique that uses microscopic diamond particles to generate unique, non-cloneable patterns on precious metal surfaces.
Developed by INCM in collaboration with Instituto Pedro Nunes (IPN) and Universidade de Coimbra (UC), Uniquemark® introduces a disruptive approach to the certification of high-value pieces. By embedding diamond particles through a precise and randomised dispersion using the traditional punching method, each mark forms a singular “fingerprint” that enhances security and enables reliable authenticity verification.
In this new stage of the Uniquemark® project, Fraunhofer Portugal AICOS (FhP-AICOS) is supporting the Assay Office in overcoming two challenges: preventing powder agglomeration and ensuring consistent application on curved surfaces. Drawing on multidisciplinary expertise from the Connected Things and Human-Centred Design groups, FhP-AICOS is analysing the current dispenser architecture and working methods to specify, develop, and validate an improved device.
The enhanced dispenser will combine technical accuracy with ergonomic design, ensuring ease of use, operational safety, and seamless integration into existing hallmarking workflows. In close collaboration with technicians from the Assay Office, FhP-AICOS is applying user-centred design methodologies, rapid prototyping, and iterative testing in real production environments. The result will be a robust, manufacturable solution that meets both technical requirements and the practical needs of end-users.
According to Miguel Roque, the FhP-AICOS researcher leading the project:
"The main goal of the UniqueMark® technology is to innovate the traditional punching method used in the certification and hallmarking of jewellery, making the process more secure and resistant to fraud. In this phase of the project, we focused on developing a device capable of applying a pre-defined approach — combining a well-known mechanical technique with the random dispersion of microscopic diamond particles. The result is a unique, QR code-like pattern in each mark, making every jewellery piece both unique and verifiable."
As part of this phase, FhP-AICOS is responsible for delivering a fully functional prototype of the new dispenser, along with comprehensive technical documentation that enables INCM to test, validate, and scale this innovative solution. This collaboration further demonstrates the value of applying rigorous scientific research and engineering expertise to tackle complex challenges, while reflecting AICOS’ commitment to advancing innovation through trusted partnerships and a clear focus on real-world application.
According to Francisco Bastos, Director of INCM’s Assay Office:
“Hallmarking precious metal artefacts is the oldest form of consumer protection, a practice maintained in Portugal since the 13th century. He emphasized that, in a rapidly changing environment, staying relevant requires continuous innovation and enhanced security to strengthen trust across the goldsmithing sector.
UniqueMark digital certificates for high-value jewellery create a secure, verifiable digital fingerprint accessible to anyone with a smartphone. The collaboration with FhP-AICOS has been instrumental in refining this new marking technology, particularly in usability, precision, and seamless integration into existing hallmarking processes.
INCM is proud of the progress achieved through this collaboration and looks forward to building on these results. Want to learn more about UniqueMark® technology? Click the link to watch the video and explore this solution in detail - https://www.youtube.com/watch?v=r3Ezusj0yRI.