Professional dichroscope with high-purity natural calcite core, providing clear and stable dichroism observation for accurate gemstone identification Excellent light transmittance and strong polarization performance, clearly showing dichroism and trichroism in colored gemstones like sapphire, ruby, tourmaline and tanzanite High-precision optical lens ensures distortion-free imaging, helping distinguish natural gems from synthetic and simulants quickly and reliably Compact and lightweight design with protective case, easy to carry for outdoor, laboratory and jewelry store on-site testing Standard gemological structure, no need for power supply, simple operation, suitable for gemologists, jewelers, collectors and teaching use