Gemology Characterization and Identification of Beryllium Diffused, Heated and Untreated Bicolor Sapphires from Changle City, China
CHEN Tao1, 2, YANG Ming-xing1
1. Gemmological Institute, China University of Geosciences, Wuhan 430074, China 2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
Abstract：Be-diffused, heated and untreated bicolor sapphires (blue and yellow) from Changle City, Shandong Province, China were studied by using standard gemological methods, ultraviolet-visible (UV-Vis) spectroscopy, infrared (IR) spectroscopy, electron microprobe, and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to obtain the spectra characterization, and to suggest identification methods for them. Only Fe3+—Fe3+ absorption bands formed in ultraviolet region appear in Be-diffused bicolor sapphire, which is especially strong at 377 nm. In IR absorption spectra, absorption peak at 3 310 cm-1 appears in heated and untreated bicolor sapphires, while it disappears in Be-diffused bicolor sapphire. Therefore, UV-Vis and IR absorption spectra can be used to identify Be-diffused, heated and untreated bicolor sapphires. On the other hand, methylene iodide immersion observation also can be used to identify Be-diffused bicolor sapphire.
陈 涛1, 2，杨明星1 . Be扩散处理、热处理和天然双色昌乐蓝宝石的宝石学特征与鉴别[J]. 光谱学与光谱分析, 2012, 32(03): 651-654.
CHEN Tao1, 2, YANG Ming-xing1. Gemology Characterization and Identification of Beryllium Diffused, Heated and Untreated Bicolor Sapphires from Changle City, China . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(03): 651-654.
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