The Unique Reflection Spectra and IR Characteristics of Golden-Color Seawater Cultured Pearl
YAN Jun1, 2, TAO Jin-bo2, DENG Xiao-qiong2, HU Xian-chao3, WANG Xiao-xiang1*
1. Department of Material Science and Engineering, Zhejiang University, Hangzhou 310027, China 2. Zhejiang Institute of Quality Inspection Science, Hangzhou 310013, China 3. Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou 310014, China
Abstract：A comparative study on the natural-color golden seawater cultured pearls and the treated-color golden seawater cultured pearls were carried out by UV-Vis reflectance spectra. Furthermore, the frequency variations of ν3, ν1, ν2 and ν4 bands of the aragonites (a crystal form of calcium carbonate) with the positions of nacreous layer and nucleus in natural or treated-color golden-color seawater cultured pearls were firstly systematically measured. The results showed that: (1) based on the results of UV-Vis reflectance spectra of natural or treated-color golden seawater cultured pearls, interestingly, it was firstly found that the natural-color golden one displays slight varied UV-Vis reflection spectra because of its different surface microstructure located on the outer nacreous layer. Meanwhile, according to the characteristic of UV-Vis reflectance spectra of treated-color golden ones, the treated-color ones were firstly classified to four categories. (2) The frequency of ν2 band of aragonite in nacreous layer of natural-color or treated-color golden pearls was greater than the other one from theirs corresponding nucleus, namely A clear blue shift was observed in the former. But the other bands were not altered in the positions of nacreous layer and nucleus, and had the same valves with synthetic aragonites. Additionally, the location of absorption bands of aragonite in nacreous layer of natural or treated-color golden pearls had no frequency shift, which indicates that the behavior of color-treating had no effect on the crystal structure of golden pearls.
Key words：Natural-color golden seawater cultured pearl;Treated-color golden seawater cultured pearl;Biogenic aragonite;Frequency shift
严 俊1, 2，陶金波2，邓小琼2，胡仙超3，王小祥1* . 金色海水养殖珍珠异常的UV-Vis反射与FTIR光谱特征 [J]. 光谱学与光谱分析, 2014, 34(05): 1206-1210.
YAN Jun1, 2, TAO Jin-bo2, DENG Xiao-qiong2, HU Xian-chao3, WANG Xiao-xiang1* . The Unique Reflection Spectra and IR Characteristics of Golden-Color Seawater Cultured Pearl . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(05): 1206-1210.
[1] Komatsu H. Journal of the Gemmological Society of Japan, 1999, 20(1-4): 111. [2] Hargett D. Gems & Gemology, 1989, 25(3): 174. [3] Elen S. Gems & Gemology, 2002, 38(2): 156. [4] Elen S. Gems & Gemology, 2001, 37(2): 114. [5] QI Li-jian, HUANG Yi-lan, ZENG Chun-guang(亓利剑, 黄艺兰, 曾春光). Journal of Gems and Gemmology(宝石和宝石学杂志), 2008, 10(4): 1. [6] Needham A E. The Significance of Zoochromes. New York: Springer-Verlag, Berlin, Heidelberg, 1974. 1. [7] CHEN Yu, GUO Shou-guo, SHI Ling-yun(陈 育, 郭守国, 史凌云). Acta Optica Sinica(光学学报), 2009, 29(6): 1706. [8] Gauthier J P, Lasnier B. Revue de Gemmologie A.F.G., 1990, 103: 3. [9] Parker A R. Journal of the Royal Society Interface, 2005, 2(2): 1. [10] Vukusic P. Sambles J R, Lawrence C R. Nature, 2000, 404: 457. [11] Vukusic P, Sambles J R, Lawrence C R. Nature, 2003, 424: 852. [12] Zi J, Yu X, Li Y, et al. PNAS, 2003, 100(22): 12576. [13] Paker A R, Welch V L, Driver D, et al. Nature, 2003, 426: 786. [14] Yablonovitch E. Physical Review Letters, 1987, 58(20): 2059. [15] John S. Physical Review Letters, 1987, 58(20): 2486. [16] Pokroy B, Fieramosca J S, Von Dreele R B, et al. Chemistry of Materials, 2007, 19(13): 3244.
