If lab diamonds are the same chemically as natural, how do diamond testers work?

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By diamond testers I mean the ones from videos online that lights up all the way if a diamond is real. How do lab grown not also set those off?

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Lab-grown diamonds won’t show as fake in those detectors – but lab-grown diamonds aren’t how most people “fake” a diamond, as those are still pretty expensive to make (need to apply a lot of pressure and meet other conditions which costs money for equipment to the point that if you’re doing it just to have some jewelry it’s less hassle and money to just get the jewelry at marked-up prices), but other rocks like cubic zirconia and substances like glass are polished and made to look like diamonds by various means (adding reflective materials to the bottom and other little tricks to fool the naked eye) and put into jewelry in the place of real diamonds either by people making jewelry on the cheap or people trying to rip off uninformed buyers of expensive jewelry.

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