How do you read a diamond tester?

If LED lights up to the red zone with three periodic bees, the stone being tested is a diamond. If LED lights up only to the green and/or yellow zone, then the stone is a stimulate or non-diamond. If the probe tip comes into contact with metal, the diamond tester will emit a continuous beep.

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How does a diamond tester work?

A diamond tester works by sending heat into the stone and measuring how fast the stone conducts the heat. Each type of gemstone has its own characteristic rate for conducting heat.