Do the diamond testing devices really work? Can they tell real from fake diamonds?
Many of these diamond testers do work, but it's important to understand how they work and what they are testing. The original diamond testers performed a thermal conductivity test, and could distinguish genuine diamond from simulants such as cubic zirconium. But then moissante, a new diamond simulant, came on the market, and it had thermal conductivity values very close to diamond, and first generation diamond testers could not identify it. A second generation tester that also tests for electrical conductivity can distinguish moissanite, since moissanite conducts electricty and genuine diamond does not. Just remember that synthetic diamonds are genuine diamonds and will be identified as such by these simple testers, since their thermal and electrical conductivity is the same as natural diamond
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