Jochen Müller, President of the German Diamond and Gemstone Exchange and Head of the Steering Committee of the prestigious international trade show Intergem e.V. By Chris Colemont Mr. Jochen Müller, a third-generation diamantaire, serves the Diamant- und Edelsteinbörse Idar-Oberstein e.V. (the Diamond and Gemstones Exchange Idar-Oberstein) (DEIO) as its president …