Costeffective and lightweight gemological refractometer designed for jewelers and gem dealers to efficiently measure polished stones with a refractive index in the range 1.30 to 1.81 RI. Versatile functionality: in addition to measuring refractive index, it helps determine if a stone is isotropic or anisotropic and whether it is uniaxial or biaxial, aiding gem identification. Broad applicability: can measure the refractive index of numerous crystalline minerals, provided they have a flat and polished surface, making it a versatile addition to your gemology toolkit. Essential for gemstone identification: refractive index is a critical optical parameter for the identification and authentication of polished precious and semiprecious stones, ensuring accurate assessments. Compact and portable design with straightforward operation for daily use in a professional setting. Use scenarios: In a jewelry workshop or showroom, quickly verify the refractive index of polished stones during decisions or grading to distinguish similar stones. In a gem dealer's inspection process, determine isotropy/anisotropy and uniaxial vs biaxial properties to narrow down possible identifications. In mineral analysis, measure the refractive index of minerals with flat, polished surfaces to expand the scope of your gemology toolkit.