How does a jeweller tell whether a gemstone is real or fake?
In: Other
It depends on the gem in question.
Diamonds for example are REALLY good conductors of heat. Absurdly good compared to most other things that look like diamonds. So cheap “diamond testers” just try to measure that property. However there because there is one diamond look-alike that will fail the heat conductivity test (Moissanite), so better (more expensive) diamond testers use electrical conductivity to account for that.
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