Raman Spectroscopy Study on the Surface of High Temperature and High Pressure Diamond Crystal in Geology, Rock and Minerals

Abstract

This paper analyses the colour origin and colour change mechanism of high temperature and high-pressure synthetic diamonds through experiments. In this paper, ultraviolet-visible absorption spectroscopy, infrared spectroscopy, photoluminescence spectroscopy, three-dimensional fluorescence spectroscopy, laser Raman spectroscopy and X-ray rocking curve were used for analysis. The results show that it is easy to identify genuine and fake gemstones based on Raman testing of the gemstone itself. The measurement of tiny inclusions with a confocal microscope system can provide information on whether the gemstone is natural or artificially improved, and even trace the origin of the gemstone. Width at half maximum of the Raman spectrum. Phonon "lifetime" can provide information on whether the gemstone is natural or synthetic. The photoluminescence spectrum of gemstones can also provide valuable information about the sample. This article can also identify natural gemstones or synthetic gemstones accordingly.