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the heat transfer conduction in diamond is very high (2000 w/m-k). that is attributable to the fact that diamond is composed of carbon atoms with stiff chemical bonds between them. heat transfer in diamond is carried by vibrations, known as phonons. in a crystal, atoms are arranged in an orderly fashion. the bond between these atoms is like a spring.

when one set of atoms get excited, it creates a wave by exciting the other atoms. this phenomenon is called phonon. by comparison, heat transfer in metals is transmitted by free electrons. in copper, heat flows five times slower than in diamond. early thermal management applications of natural diamond included microwave and laser diode devices.

but, the availability and cost of natural diamond restricted its wider development. industrial-made synthetic diamonds, however, opened new opportunities.  [1] 

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