I bought this because I get a lot of vintage jewelry and dodgy stones from time to time which can be CZ or diamonds set in sterling or gold. I followed the instructions to warm up and calibrate the device, then tested it against what I knew for sure to be clear rock crystal, cubic zirconia, and diamonds. The tester works exactly as expected and I am very happy with it. The price made it even better and I will definitely buy another one if the need arises.
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