QI Li-jian, CENG Chun-guang. Beryllium-Diffused Treatment Sapphire with Blue Body Colour[J]. Journal of Gems & Gemmology, 2008, 10(1): 1-4.
Citation: QI Li-jian, CENG Chun-guang. Beryllium-Diffused Treatment Sapphire with Blue Body Colour[J]. Journal of Gems & Gemmology, 2008, 10(1): 1-4.

Beryllium-Diffused Treatment Sapphire with Blue Body Colour

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  • Received Date: January 17, 2008
  • Revised Date: February 17, 2008
  • A type of beryllium-diffused treatment sapphire with blue or light blue body colour has recently appeared on gem markets.The chemical compositions,Raman spectrum and the characteristics of UV-NIS absorption spectrum of 50beryllium-diffused treatment sapphires samples are investigated by using EPMA,LA-ICP-MS,laser Raman spectrometer and micro-optical fibre spectrometer.The testing and research reasults show that the minimum mass percent of beryllium is5.28×10—6% and the maximum is17.51×10—6% and the average is8.74×10—6% in the beryllium-diffused treatment sapphire samples.Generally,the samples contain all forms of baddeleyite melting or pseudomorph inclusions.Because of d—d electron transition in the Fe3+ion,the absorption spectrum band a (377,386,451nm)of the samples is formed.With the high temperature,the beryllium-diffused and induced vacancy colour center may result in the blue colour of sapphire.
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