In industrialized countries, the rapidity of development has not taken into account the fact that it would be opportune to formalize "niche" knowledge. There is an ever-growing need for a written formalization of tacit knowledge. The aim of this activity consists in building specialized knowledge collections, which are useful to help and to guarantee the continuity of small and medium-sized business during successions, and to guarantee staff training related to specific practices. To reach this aim, this work presents the construction of a faceted thesaurus (GoldThes) for the domain of goldsmith handcraftsmanship, which tries to classify and organize a domain extracted from a regional context. The use of this kind of system demonstrated how classifying and organizing information into multi-dimensional hierarchies makes it more accessible than using a single taxonomy, that is a unique hierarchical dimension.