Abstract
The results are reported of high-pressure–high-temperature (HPHT) treatmentexperiments on natural diamonds of different origins and with different impuritycontents. The diamonds are annealed in a temperature range up to 2000̂C atstabilizing pressures up to 7 GPa. The evolution is studied of different defects inthe diamond crystal lattice. The influence of substitutional nitrogen atoms, plasticdeformation and the combination of these is discussed. Diamonds arecharacterized at room and liquid nitrogen temperature using UV–visiblespectrophotometry, Fourier transform infrared spectrophotometry andphotoluminescence spectrometry. The economic implications of diamond HPHTtreatments are discussed.
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