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Author Topic: Thermal Conductivity Diamond Testers - False Diamond Positive on Phenakite  (Read 1030 times)

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Offline tonofsteel

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If you are testing gems with one of the popular "Diamond Selector II" or other similar thermal conductivity testers it can be fooled into reading diamond when it is really Phenakite.

Phenakite is very rare as well and does look very similar to diamond, although someone with enough experience could tell something is off.

Gemlab released some information/testing on this:

I do not see this come up in the search results so just thought I would share, not much info out there on possible false positives with these detectors.  (due to correct use / calibration showing a diamond when it is not.  Lots out there with people not calibrating these things correctly though and getting the wrong result)