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A diamond is basiclly a clear depending lump of coal it is 100% carbon and carbon is not a good conductor of electricity but is heat since it does burn easily and that is mixed with other elements so imagine 100% pure carbon
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um, the answerer got confused between combustion and conduction oh heat?
i guess so
even burning diamond is very difficult because of its bond
I guess that huge answer basically means to say that in diamond, unlike metals the conduction of heat is not due to vibrations of electrons but due to some lattice vibrations
see diamonds at 800  degree celcius burn to give out carbon dioxide