Identification of High-Luster and Lusterless Freshwater-Cultured Pearls by X-Ray Absorption Spectroscopy

Monarumit, Natthapong; Noirawee, N.; Phlayrahan, Aumaparn; Promdee, Kittiphop; Won-In, Krit; Satitkune, Somruedee

doi:10.1007/s10812-015-0163-3

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…Unlike the vaterite, which is an unstable phase of CaCO 3 and is rarely detected in Chinese fleshwater peals, aragonite is the main phase of CaCO 3 in these pearls. During the process of growth, the nacre layer of beadless pearls may generate the crack fulfilled with the calcite 12 . The calcite, mixing with other organic matters, appears yellow and lows the quality of pearls.…”

mentioning

confidence: 99%

Automated Internal Classification of Beadless Chinese ZhuJi Freshwater Pearls based on Optical Coherence Tomography Images

Zhou

Liu²,

Shi

et al. 2016

Sci Rep

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Optical coherence tomography (OCT) has been applied to inspect the internal defect of beadless Chinese ZhuJi fleshwater pearls. A novel fully automated algorithm is proposed to classify between normal and defective sub-layer in nacre layer. Our algorithm utilizes the graph segmentation approach to estimate the up and down boundaries of defect sub-layers from flattened and cropped image, and also proposes the strategy for edge and weight construction in segmentation process. The vertical gradients of boundary pixels are used to make grading decision. The algorithm is tested by typical pearl samples, and achieves 100% classification accuracy. The experiment result shows the feasibility and adaptability of the proposed approach, and proves that the OCT technique combined with proposed algorithm is a potential tool for fast and non-destructive diagnosis of internal structure of beadless pearl.

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confidence: 99%

Automated Internal Classification of Beadless Chinese ZhuJi Freshwater Pearls based on Optical Coherence Tomography Images

Zhou

Liu²,

Shi

et al. 2016

Sci Rep

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“…The analyzes were done in reflectance mode on a FTIR spectrometer with Bruker accessory (EQUINOX 5). Spectra were automatically corrected for water, carbon dioxide and the KBr background (Monarumit et al, 2015;Zhang et al, 2016;Cardoso et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

Nacre morphology and chemical composition in Atlantic winged oyster Pteria colymbus (Röding, 1798)

Santana¹,

Aranda²

2021

PeerJ

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The microstructure and nanostructure of nacre in Pteria colymbus were studied with high-resolution field emission scanning electron microscopy (FESEM). The tablets were found to be flat and polyhedral with four to eight sides, and lengths ranging from 0.6 to 3.0 µm. They consisted of nanocrystals 41 nm wide, growing in the same direction. X-ray diffraction showed the crystals to be mineral phase aragonite, which was confirmed by Raman spectroscopy. Fourier transform infrared spectroscopy identified a band at 1,786.95 cm−1 attributed to carboxylate (carbonyl) groups of the proteins present in the organic matrix as well as bands characteristic of calcium carbonate. X-ray fluorescence showed the nacre to contain 98% calcium carbonate, as well as minor elements (Si, Na, S and Sr) and trace elements (Mg, P, Cu, Al, Fe, Cl, K and Zn).

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“…Micro-infrared spectroscopy, Raman spectrometry, scanning electron microscopy and X-ray diffraction are all commonly employed to distinguish between freshwater and saltwater cultured pearls [83].…”

Section: Spectroscopymentioning

confidence: 99%

Recent Trends in Freshwater Pearl Farming in India

Saurabh¹,

Pradhan²,

Suman³

2022

Update on Malacology

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Cultured pearls have an important place in international trade. The Vedas, the Bible, and the Koran all mentioned pearls, and they are regarded as one of the highest honours. Pearls are generated in nature when an irritant, such as a sand grain or a parasite, is swept into the pearl molluscs and lodged within it, where it is coated with micro-layers of nacre, a lustrous substance made up of 80–90 per cent aragonite crystals of CaCO3. The ICAR-Central Institute of Freshwater Aquaculture (CIFA), Kausalyaganga, Bhubaneswar, India, has created a base technology for cultivating pearls in freshwater habitats, recognising the scope and value of freshwater pearl production. Indian pond mussel, Lamellidens marginalis is the major species used in freshwater pearl aquaculture. In addition, ICAR-CIFA has pioneered a novel feature of freshwater pearl farming. The Institute has also taken the lead in disseminating freshwater pearl culture technology to the country’s fish farming communities, entrepreneurs, researchers, and students to build a sustainable model for the country’s socio-economic development. In this chapter, we will briefly cover pearls and their types, their historical significance, the spread of pearl mussels of freshwater origin in various countries, pearl biomineralisation, pearl farming techniques, and factors affecting pearl quality, among other things.

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Identification of High-Luster and Lusterless Freshwater-Cultured Pearls by X-Ray Absorption Spectroscopy

Cited by 11 publications

References 11 publications

Automated Internal Classification of Beadless Chinese ZhuJi Freshwater Pearls based on Optical Coherence Tomography Images

Automated Internal Classification of Beadless Chinese ZhuJi Freshwater Pearls based on Optical Coherence Tomography Images

Nacre morphology and chemical composition in Atlantic winged oyster Pteria colymbus (Röding, 1798)

Recent Trends in Freshwater Pearl Farming in India

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