The physical classification of diamond is based on the optical absorption of nitrogen, boron and hydrogen-related defects and paramagnetic absorption of single substitutional nitrogen. The first classification of diamonds into types I and II based on the peculiarities of their optical absorption was given by Robertson et al. (1934). The first definite classification of the modern type was given by Dyer et al. (1965a).
KeywordsNatural Diamond Synthetic Diamond Natural Type Absorption Continuum Electrical Specific Conductivity
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