Identification of High Pressure-High Temperature Treated Gem Diamonds using a Micro-Raman Spectroscopy

고압고온 처리된 보석용 다이아몬드의 마이크로라만 분석에 의한 감별 연구

  • 손오성 (서울시립대학교 신소재공학과) ;
  • 김종률 (서울시립대학교 신소재공학과)
  • Published : 2006.10.31

Abstract

Diamonds have been widely employed as polishing media for precise machining and noble substrates for microelectronics. The recent development of the split sphere press has led to the enhancement of low quality natural diamonds. Synthesized and treated diamonds are sometimes traded deceptively as high quality natural diamonds because it is hard to distinguish among these diamonds with conventional gemological characterization method. Therefore, we need to develop a new identification method that is cheap, fast, and non-destructive. We proposed using a new method of micro-Raman spectroscopy for checking the local HPHT residual stress to distinguish these diamonds from natural ones. We observe unique ~10f compressive and tensile strains at Type I and Type II diamonds after HPHT treatment. Our result implies that our proposed methods may be appropriate fur identification of the treated diamonds with appropriate reference samples.

Keywords

natural diamond;treated diamond;micro-Raman spectroscopy;Raman shift;High pressure-High temperature