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Beryllium-Diffused Treatment Sapphire with Blue Body Colour

QI LI-jian1,C.G.Zeng2(1.Tongji University,Shanghai 200092,China;2.Nan YangGemological Institute,Singapore 228208,Singapore)  
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 50 beryllium-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 is 5.28×10-6 % and the maximum is 17.51×10-6 % and the average is 8.74 ×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(377,386,451 nm)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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