Spectroscopy and Spectral Analysis, Volume. 32, Issue 3, 651(2012)
Gemology Characterization and Identification of Beryllium Diffused, Heated and Untreated Bicolor Sapphires from Changle City, China
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.
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CHEN Tao, YANG Ming-xing. Gemology Characterization and Identification of Beryllium Diffused, Heated and Untreated Bicolor Sapphires from Changle City, China[J]. Spectroscopy and Spectral Analysis, 2012, 32(3): 651
Received: Jul. 3, 2011
Accepted: --
Published Online: Apr. 16, 2012
The Author Email: Tao CHEN (summerjewelry@163.com)