Precision is the foundation of professional gemstone analysis and valuation. Presidium develops high-quality measuring and precision instruments that enable jewellers, goldsmiths and gemologists to determine gemstone dimensions, weight and optical properties with exceptional accuracy.

Whether measuring loose gemstones, determining the refractive index or accurately weighing diamonds and coloured gemstones, Presidium instruments deliver the precision and reliability required for professional jewellery workshops, laboratories and appraisal services.

The Presidium range includes electronic and mechanical gemstone gauges, the Gem Computer Gauge for precise gemstone measurement, the Refractive Index Meter II for professional refractive index analysis and precision carat scales for accurate weight determination. Designed for everyday professional use, each instrument combines advanced technology, ease of operation and dependable performance.