How to check and distinguish color gemstones? How to distinguish diamonds from simulants? How to confirm the authenticity of popular colored gemstones? The SmartPro Gem-Eye I is a gemstone tester that identifies various colored gemstones based on the latest gemmological findings and distinguishes genuine diamonds from various simulants. The test method of the diamond tester is based on the thermal conductivity of the gemstones. Due to its extra thin test pin, diamonds and gemstones as small as 0.01ct can be tested. The robust gemstone tester is operated with AAA batteries. Practical: The device is pre-calibrated at the factory, so you can start testing immediately. Play it safe and verify the identity of colored gemstones and protect yourself from attempts to deceive you with fake diamonds!