Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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A basic study for color identification of amethyst by spectrophotometer

분광광도계를 이용한 자수정의 색상 감별 기초 연구

  • Yoon, Si-Nae (Department of Gemology, Daegu Polytechnic College) ;
  • Song, Young-Jun (Department of Materials and Metallurgical Engineering, Kangwon Univ.) ;
  • Yon, Seog-Joo (Department of Gemological Engineering, Dong.shin University)
  • 윤시내 (대구산업정보대학 보석감정과) ;
  • 송영준 (강원대학교 재료금속공학과) ;
  • 연석주 (동신대학교 보석공학과)
  • Published : 2008.08.31
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Abstract

This study was carried out for the purpose of obtaining the basic data for color identification of amethyst by spectrophotometer. For this, the eleven amethyst stone and one citrine stone from eight countries were prepared in facet cut or plate. The transmittance and reflection of this samples were investigated as a function of wavelength. The transmittance or reflection was transformed to tristimulus value (X, Y, Z) and chromaticity value (x, y, z) and then compared with the results of eye observation which was plotted on cm xyY color space. Finally, the influence of the amethyst's thickness on transmittance or reflection was investigated.

본 연구에서는 분광광도계를 사용하여 자수정의 색상을 측정하고 자료를 해석함으로써 유색보석의 색상을 정밀하게 측정하기 위한 그 기초자료를 얻고자 하였다. 판상과 실물형태로 가공된 자수정 시료에 대하여 자외선${\sim}$가시광선 영역의 빛을 조사(照射)하고 시료에 의하여 반사 또는 투과되는 빛의 파장별 농도를 측정하고 이 자료로부터 인간의 눈이 느끼는 색감인 3자극치를 구한 다음 이를 근거로 CIE xyY 값을 구하였으며, 그 결과를 육안관찰 결과치와 비교하였다. 아울러 색상 측정 결과에 미치는 시료 두께의 영향도 함께 고찰 하였다.

Keywords

References

  1. S.-N. Yoon, "Gem identification", Human Resources Development Service of Korea (2005) 24
  2. S.-N. Yoon, "A study on the characterization of amethyst using advanced analytical instrument", PhD Thesis, Dongshin University (2006) 1
  3. H.Y. Lee, "Study on the formation of smoky color centers in $\gamma$-irradiated $\alpha$-quartz by means of thermoluminescence", Journal of the Korean Physical Society 1(1) (1968) 9
  4. K.J. Song, et al., "Temperature dependence of the $Fe^{3+}$-centers in natural amethyst", New Physics 32(3) (1992) 442
  5. C.W. Park and P.C. Kim, "The color enhancement of natural Zambian amethyst by the hydrothermal treatment method", Journal of the Korean Crystal Technology 14(2) (2004) 73
  6. L.B. Pasternak, et al., "Growth and light-induced colour centres in crystals of yttrium aluminum garnet doped with $Cr^{3+}$ ions", Journal of Crystal Growth 52(2) (1981) 546 https://doi.org/10.1016/0022-0248(81)90337-7
  7. C.S. Han, "EPR study of the Fe$^{3+}$-centers in natural amethyst occurring in Korea", PhD Thesis, Korea University (1986)
  8. C.S. Han and S.H. Choh, "EPR study of iron centers in natural amethyst", Journal of the Korean Physical Society 22(21) (1989) 241
  9. D. Choi, G.J. Son and Y.M. Kim, "EPR study of the [AlO$_4$/Ag$^+$]$^+$ center in $\alpha$-quartz", New Physics 33(1) (1992) 93
  10. S.-N. Yoon, "Gem identification", Human Resources Development Service of Korea (2005) 355
  11. Korean Standard Council, "Standard illuminants and sources for colorimetry", Korean Standard KS A 0074, Korean Standard Association (1985)
  12. Korean Standard Council, "Methods of visual compaarison for surface colours", Korean Standard KS A 0065, Korean Standard Association (2005)
  13. Korean Standard Council, "Methods of measurement for colourof reflecting or transmitting objects", Korean Standard KS A 0066, Korean Standard Association (2006)