Gemstone Refractometer - Fast and accurate identification of single and double refractive gemstones. It helps identify diamonds, moissanites and color gemstones, accelerates the identification of gemstones in packages, and delivers consistent and reliable results every time. - High accuracy. This professional gemstone tester specializes in the quick and accurate identification of single and double refractive gemstones and stands out as a professional tool for gemologists. With a measuring range of 1.30 to 1.81, it offers a variety of identification options. - Stable performance. The refractometer features a highly visible display for easy reading. With the integrated light source and clear digital scale display, you can use the refractometer in different environments. - How to measure. Drop a small amount of oil onto the surface of the prism through a thin glass rod to judge whether a gemstone is single-axis or biaxis photopositive, or photonegative. Applications and use scenarios - Retail or packing inspection. Use during incoming shipments to quickly screen stones and verify identities before processing or sale. - On-site gemology work. Suitable for field testing in stores, at shows, or in client meetings to confirm gemstone types and refractive properties. - Laboratory triage and inventory. Helpful for sorting and prioritizing stones during appraisal, grading, or inventory management. Key attributes - Function: gemstone identification by refractive properties for diamonds, moissanites and color gemstones; fast and reliable results. - Identification range: single and double refractive gemstones; measuring range 1.30 to 1.81. - Compatibility and environments: designed for use in various environments with an integrated light source and clear digital scale display. - Performance: highly visible display, stable measurement capabilities, consistent results.