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Gemstone Tester Diamond Gems Selector II with LED Indicator for Detecting Fake Diamond, Sapphire, Ruby, Crystal, Agate, Jade, Jewel, Gems, Gemstone, Precious Stones Kulti Culti Diamond Selector II 2. The diamond selector ii is a professional and portable diamond tester built to quickly distinguish diamond from cz common stimulants such as white corundum, yag, and american diamond. The diamond selector ii will test stones large and small, mounted or uncounted, with ease and reliability. This is the most affordable diamond tester on the market today. This tester is perfect for the working jewelry professional, jewelry lover, and flea market attendees; it is simplistic but accurate testing to ensure that you do not make a bad purchase. One error could cost more than this tester. Never second-guess again! Operating on 1 long-lasting 9-volt battery (included), this tester will automatically alert you for low battery.