From Hallmarks to Hybrid Authentication

For centuries, hallmarking has served a simple but powerful purpose: to assure buyers that a precious metal item is exactly what it claims to be. In Portugal, that responsibility sits with Imprensa Nacional – Casa da Moeda (INCM), whose Contrastaria assay offices continue to apply official marks to gold, silver, platinum and palladium articles.

But today, the Contrastaria is no longer just about stamping metal. It is evolving into something far closer to a modern authentication and traceability system – one that combines physical marks, regulatory oversight and digital verification in a single, state-backed framework.

Beyond the hallmark: a regulated ecosystem

At its core, the system still performs its traditional role. Articles submitted to the assay offices are tested for fineness and, if compliant, marked with official hallmarks that certify their composition.

These marks remain a powerful and visible guarantee of authenticity, backed by government authority and recognised across markets.