Gem Refractometer (Gemstone Refractometer) Key benefits Identify and authenticate polished precious and semiprecious gemstones Observe optical properties and the structure of gemstones Achieve performance comparable to expensive models used in gemological institutes Measure refractive index of faceted stones, assess transparency or opacity, and evaluate beauty, durability, and scarcity What it does The refractive index (RI) of a gemstone provides the single most important piece of information for identifying an unknown stone. Each gem has a typical RI dictated by its chemical composition and crystallization structure. This model is designed to deliver accurate RI measurements that support gemstone identification and characterization. It can be used to measure RI for many minerals in crystal form as long as the crystals have a flat and polished face. Through RI and related optical parameters, you can determine whether a gem is Single Refraction (isotropic) or Double Refraction (anisotropic or birefringence). Use scenarios In a jewelry or appraisal setting: quickly screen incoming stones for authenticity and provide a basis for identification and valuation. In a gem laboratory or workshop: verify stone identity before cutting, setting, or grading, using RI as a core reference value. In geology or mineral study: classify crystals and distinguish isotropic from anisotropic minerals by comparing refractive properties.