Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Gemological Identification of Black Diamonds Roughs from Zimbabwe

짐바브웨산 블랙다이아몬드 원석의 보석학적 감별연구

  • Song, Oh-Sung (Department of material science and engineering, University of Seoul) ;
  • Kim, Jun-Hwan (Department of material science and engineering, University of Seoul) ;
  • Kim, Ki-Hoon (Department of material science and engineering, University of Seoul)
  • 송오성 (서울시립대학교 신소재공학과) ;
  • 김준환 (서울시립대학교 신소재공학과) ;
  • 김기훈 (서울시립대학교 신소재공학과)
  • Published : 2009.11.30
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Abstract

Natural black diamonds of single crystal, polycrystalline, and agglomerated roughs become important for their industrial and gem stone application. We performed the conventional gemological tests of thermal diffusion, apparent density, scratch test, and magnification test as well as the advanced tests of Raman spectroscopy, X-ray diffraction test and Lang topography. We conclude that scratch test with SiC paper was the most efficient method in view point of speed and cost. Raman spectroscopy and XRD were useful for identification of diamond while Lang topography offered a good visualization method of the grain structure of polycrystalline black diamond roughs.

블랙다이아몬드는 단결정형, 다결정형, 혼합형 등의 결정질을 가지고 산업용, 보석용으로 활용도가 높다. 3ct~30ct급의 짐바브웨에서 산출된 천연 블랙 다이아몬드 러프(roughs)를 이용하여 통상적인 감별법인 열전도, 밀도검사, 스크래치검사, 확대검사와 첨단 감정 방안인 라만스펙트럼과 XRD회절 및 Lang이미지 분석을 실시하였다. 통상적인 감별방안으로는 신속성과 경제성을 고려하면 SiC스크래치검사와 확대검사를 혼합하는 방안이 유리하였다. 첨단 감정 방안으로는 라만분석으로는 블랙다이아몬드의 감별이 용이하였으나, 블랙다이아몬드 러프는 단결정과 다결정의 경우가 많아서 XRD 회절 방법으로 원석의 결정성 판단이 어려울 수 있었다. 그러나 일단 확인된 회절조건에서는 손쉽게 결정립을 Lang이미지분석을 통하여 원석의 결정상태의 시각화가 가능하였다.

Keywords

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