, Idar-Oberstein has roughly 219.3 ha of land given over to commerce. Three other areas in town, Dickesbacher Straße, Finkenberg Nord and Am Kreuz, hold a further 28 ha in reserve for economic expansion. The town also has at its disposal the rezoning area Gewerbepark Nahetal in the outlying centre of Nahbollenbach, comprising 23 ha.

The Bundesverband der Diamant- und Edelsteinindustrie e. V. (“Federal Association of the Diamond and Gemstone Industry”) has its seat in Idar-Oberstein. It represents the industry’s interests in dealings with lawmakers as well as federal, state and municipal representatives. It advises members in areas such as environmental protection, problems in competition, questions of nomenclature and so forth, and makes the necessary contacts as needed. To promote the designing and quality of jewellery and gemstones, the Association created the international competition revolving about the German Jewellery and Gemstone Prize.