Presidium is one of the world's leading manufacturers of professional testing and measuring instruments for the jewellery and watchmaking industry. For more than 40 years, the company has been developing innovative solutions for the identification, analysis and measurement of diamonds, gemstones and jewellery. Jewellers, goldsmiths, gemologists and appraisers around the world rely on Presidium's precision, reliability and technological expertise.

The comprehensive product range includes diamond testers for identifying natural, laboratory-grown and synthetic diamonds, gemstone testers for the reliable identification of coloured gemstones, as well as measuring and precision instruments for accurate gemstone measurement and weighing. 

Innovative products such as the OTi, ARI, Adamas, SAM, Multi Tester, Gem Tester II and the Refractive Index Meter II have established Presidium as a trusted name in professional gemstone testing. Designed for everyday use, Presidium instruments combine advanced technology with intuitive operation and dependable performance.

As an authorised Presidium distributor, Bullnheimer offers a comprehensive product portfolio together with expert advice and outstanding service. Discover professional testing technology trusted by experts worldwide and bring greater confidence to every diamond and gemstone evaluation.