This double diamond/moissanite tester is very accurate. I have found that most double testers under $200 do not accurately and consistently test moissanite stones under 0.25 carats. They will test them like diamonds. I tested dozens of small moissanite stones up to size 10 and they all turned out to be moissanite. The only downside I have with the tester is that it takes half a minute to warm up, the batteries don't last long. You really need to use an AC adapter (not included).
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