Browse > Article

A basic study for color identification of amethyst by spectrophotometer  

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)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.18, no.4, 2008 , pp. 146-154 More about this Journal
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.
Keywords
Color identification; Amethyst; Spectrophotometer; Tristimulus value; Chromaticity value;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 K.J. Song, et al., "Temperature dependence of the $Fe^{3+}$-centers in natural amethyst", New Physics 32(3) (1992) 442
2 S.-N. Yoon, "Gem identification", Human Resources Development Service of Korea (2005) 355
3 S.-N. Yoon, "Gem identification", Human Resources Development Service of Korea (2005) 24
4 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
5 Korean Standard Council, "Methods of measurement for colourof reflecting or transmitting objects", Korean Standard KS A 0066, Korean Standard Association (2006)
6 S.-N. Yoon, "A study on the characterization of amethyst using advanced analytical instrument", PhD Thesis, Dongshin University (2006) 1
7 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
8 Korean Standard Council, "Standard illuminants and sources for colorimetry", Korean Standard KS A 0074, Korean Standard Association (1985)
9 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
10 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
11 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   DOI   ScienceOn
12 C.S. Han, "EPR study of the Fe$^{3+}$-centers in natural amethyst occurring in Korea", PhD Thesis, Korea University (1986)
13 Korean Standard Council, "Methods of visual compaarison for surface colours", Korean Standard KS A 0065, Korean Standard Association (2005)