This virtual exhibit explores the evolution of one of gemology’s most important tools—the gem refractometer. From early optical designs to modern LED-illuminated models, the refractometer has played a central role in identifying gemstones through precise refractive index measurement.

Our curated online collection showcases historic and contemporary refractometers from notable makers around the world. Each piece highlights advancements in optical technology and the changing methods gemologists use to analyze gems. Explore the instruments that shaped gemological science, all from the convenience of our virtual museum.