Description: 【Function】: Handheld Polariscope effectively distinguishes homogeneous gemstones from heterogeneous gemstones and crystal aggregates by revealing unique optical phenomena such as anomalous birefringence and collective extinction 【Feature】: Loupe Magnifier Jeweler is equipped with a portable warm light source and precision polarizing filter, enabling clear observation of gemstone brightness variations, interference patterns, and axis determination during 360° rotation 【Identification of Key Gemstone Characteristics】: Gemstone Tester Tool can identify key gemstone characteristics, including the four bright four dark phenomenon in heterogeneous gemstones (such as quartz and sapphire), complete extinction in homogeneous gemstones (such as garnet and spinel), and the consistent brightness in polycrystalline aggregates (such as jade and agate) 【Advanced Analysis Support】: Jewelry Polarizer supports advanced analysis through interference pattern observation, detecting uniaxial crystals with a black cross pattern or biaxial crystals with curved arms and color rings. It is ideal for professional gemologists 【Material and Dimensions】: Gem Identification Tools is made of carbon steel and measures a compact 9.2cm x 3.5cm/3.62inch x 1.38inch, making it easy to use for gem identification at home or on the go Size Chart: 9.2cmx3.5cm/3.62inchx1.38inch   Package Includes: 1 set Handheld Polariscope Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.