[Jewelry making - Article 00764] - Re: [Orchid] Operating Diamond Tester

[The Doctor]

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    Oops, I forgot to answer question #3 

>     Do inclusions affect the accuracy of the readings? Am thinking
>     larger carbon inclusions, for ex. 

    Only if the inclusion reaches the surface and you touch the tester's
    tip to the included crystal it might affect the reading, but it is
    unlikely to occur. Most surface-reaching crystal inclusions tend to
    pop out of diamonds during polishing, leaving a cavity. If it
    remains, it is called a "knot." 

    Thermal diamond testers have a metal tip that heats up, then
    measures how quickly the material conducts heat away from the tip. If
    the interval is that of the thermal conductivity of diamond, it
    registers that. If not, it registers as a simulant. Testers also have
    a recovery, or "cool down" period between taking readings. If the tip
    isn't allowed to recover, it will give different readings, which may
    be a partial answer to question #2. 

James S. Duncan, G.G.
James in SoFl

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