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Spectroscopic Investigation of Pearl Samples from Online Platforms and E-Marketplaces


Paper Type 
Contributed Paper
Title 
Spectroscopic Investigation of Pearl Samples from Online Platforms and E-Marketplaces
Author 
Aumaparn Phlayrahan and Sirintra Boonchu
Email 
aumaparn.ph@go.buu.ac.th
Abstract:

     Purchasing pearls from online platforms and e-marketplaces has been around for years, where buyers could join in the thrill of the show of opening pearls from oysters or mollusks. In exchange for those materials that claim to be pearls, buyers must pay a high price per piece. In this study, the spectroscopic properties of twenty-seven samples purchased from online platforms and e-marketplaces were revealed. The FTIR spectra show the characteristic peaks of aragonite at 1483, 716, 712, and 699 cm-1, while exhibiting the vaterite peaks at 882 and 879 cm-1. Correspondingly, Raman spectra indicate the ν1 symmetrical and ν4 in-plane bending modes of the carbonate at 1083, 701, and 704 cm-1. Thus, it clarified that all the samples are pearls. The SrO/MnO ratio acquired by energy dispersive X-ray spectroscopy (EDXRF) at an average of 0.44 suggested that the samples are freshwater pearls. Apart from the white pearl, the cause of the color of the sample is separated into two factors. The natural color, which is presented in cream and peach, is caused by polyene pigments. In contrast, vivid colors such as blue, violet, purple, and pink are shown as evidence of dyes. The UV-Vis reflectance spectra also present a different absorption between natural and dyed pearls.

Article ID
e2024074
Received Date 
2024-01-12
Revised Date 
2024-05-21
Accepted Date 
2024-06-21
Full Text 
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Keyword 
freshwater pearl, pearl opening party scam, polyene pigment, dyed pearl, Raman spectra, FTIR spectra, UV-Vis reflectance spectra, EDXRF
Volume 
Vol.51 No.5 (September 2024)
DOI 
https://doi.org/10.12982/CMJS.2024.074
Citation 
Phlayrahan A. and Boonchu S., Spectroscopic Investigation of Pearl Samples from Online Platforms and E-Marketplaces, Chiang Mai J. Sci., 2024; 51(5): e2024074. DOI 10.12982/CMJS.2024.074.
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Chiang Mai Journal of Science

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