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cultured pearls

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Journal Article
Published: 01 April 2008
Mineralogical Magazine (2008) 72 (2): 579-592.
...A. L. Soldati; D. E. Jacob; U. Wehrmeister; W. Hofmeister Abstract Vaterite and aragonite polymorphs in freshwater cultured pearls from mussels of the genus Hyriopsis ( Unionidae ) were structurally and compositionally characterized by Raman spectroscopy, Micro computer tomography, high resolution...
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Freshwater <b>cultured</b> <b>pearls</b> produced in China represent 95% of the market. T...
in > Elements
Published: 01 June 2009
F igure 2 Freshwater cultured pearls produced in China represent 95% of the market. They are cultivated in mollusks belonging to Hyriopsis spp. , and they occur naturally in white, grey, yellow, orange, pink and purple colors. Various combinations of tone and saturation yield a broad range
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Raman spectra of the lower part of a pink freshwater <b>cultured</b> <b>pearl</b> (SK86; ...
Published: 01 January 2009
Fig. 2. Raman spectra of the lower part of a pink freshwater cultured pearl (SK86; diffuse reflectance spectrum is presented in Fig. 5 ) using five excitation wavelengths. The ν 1 band decomposition (with Peak Fit and constraints; see text) for the spectrum obtained with excitation at 561 nm
Journal Article
Published: 01 January 2009
European Journal of Mineralogy (2009) 21 (1): 85-97.
...Fig. 2. Raman spectra of the lower part of a pink freshwater cultured pearl (SK86; diffuse reflectance spectrum is presented in Fig. 5 ) using five excitation wavelengths. The ν 1 band decomposition (with Peak Fit and constraints; see text) for the spectrum obtained with excitation at 561 nm...
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Journal Article
Published: 01 April 1991
American Mineralogist (1991) 76 (3-4): 641-646.
...J. Urmos; S. K. Sharma; F. T. Mackenzie Abstract Raman spectra are reported for biogenic carbonates from a scleractinian corcl ( Porites sp.), pink pigmented ( Corallium regale ) and unpigmented ( Corallium secundum ) precious corals, and natural and cultured pearls. Spectra of aragonitic Porites...
Journal Article
Journal: Elements
Published: 01 June 2009
Elements (2009) 5 (3): 179-180.
...F igure 2 Freshwater cultured pearls produced in China represent 95% of the market. They are cultivated in mollusks belonging to Hyriopsis spp. , and they occur naturally in white, grey, yellow, orange, pink and purple colors. Various combinations of tone and saturation yield a broad range...
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Journal Article
Published: 01 August 2014
European Journal of Mineralogy (2014) 26 (4): 507-516.
... mineralization has been found in freshwater pearls ( Ma & Lee, 2006 ; Soldati et al. , 2008a and b ; Wehrmeister et al. , 2007 ; Qiao et al. , 2007 ), while calcite structures occur in cultured pearls in marine environments ( Böggild, 1930 ; Kawakami, 1952 ; Cuif & Dauphin, 1996 ; Cuif et al...
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Journal Article
Published: 01 October 2004
American Mineralogist (2004) 89 (10): 1353-1358.
... to pigments ( Elen 2002 ). A selection of cultured P. maxima pearls, covering the full spectrum of body colors, was provided by Atlas Pacific Limited from pearl farms in Indonesia. These pearls were cut in half with a diamond saw and one half kept for color reference. The other half was broken and thin...
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Journal Article
Published: 01 September 2009
Journal of Sedimentary Research (2009) 79 (9): 689-710.
...Brian Jones Abstract Cave pearls, up to 8 cm long, collected from dried-out rimstone pools in Old Man Village cave on Grand Cayman, British West Indies, have nuclei (e.g., bone) that are encased by laminated cortices. These laminae are composed of trigonal prismatic calcite crystals, calcite...
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<b>Pearls</b>, as well as coral, are the product of biomineralization, that is, th...
in > Elements
Published: 01 June 2009
in the Sea of Cortez, Mexico, delivers an annual production of a mere 3.5 kg of cultured saltwater pearls (shown here) with strong “body” and “secondary” colors (diameter of the pearls in the photo is ∼9 mm). P hotograph by P erlas del M ar de C ortez , G uaymas , M exico
Journal Article
Published: 01 March 2003
Journal of Paleontology (2003) 77 (2): 323-330.
..., The Burke Museum of Natural History and Culture, University of Washington, Seattle, Washington. Euphylax dovii Stimpson , 1860 . Mesogastric region very narrow anteriorly, ridged; bounded by small, circular epigastric swellings; at midlength by large, posteriorly widening protogastric region...
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Series: Geological Society, London, Special Publications
Published: 01 January 2009
DOI: 10.1144/SP319.5
EISBN: 9781862395671
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Journal Article
Journal: GSA Bulletin
Published: 02 May 2018
GSA Bulletin (2018) 130 (9-10): 1615-1644.
... two more polarity zones, which they associated with C28r and C28n. The study by LeCain et al. (2014) assessed magnetostratigraphy for four additional sections that covered the entire Hell Creek Formation and Tullock Member (Pearl Lake, Garbani Hill, Biscuit Butte, Flag Butte). Similar to Swisher et...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 2015
GSA Bulletin (2015) 127 (3-4): 393-409.
... . These are computed from two or more locations where appropriate, including data from Renne et al. (2013) , as described in Appendix B . The chron 29r/29n reversal age was calculated from the Pearl Lake magnetostratigraphic section reported in LeCain et al. (2014) . This section is ∼1 km northeast from our...
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Series: European Mineralogical Union Notes in Mineralogy
Published: 01 January 2012
DOI: 10.1180/EMU-notes.12.13
EISBN: 9780903056366
... and amber. Polyenic pigments have been identified in some coloured (natural and cultured) pearls and corals ( Merlin & Dele-Dubois, 1986 ; Urmos et al ., 1991 ; Karampelas et al ., 2007 ). Chemically, polyenes are polyunsaturated organic compounds that contain two or more sequences of alternating...
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Series: Geological Society, London, Special Publications
Published: 01 January 2014
DOI: 10.1144/SP388.21
EISBN: 9781862396647
.... The cases examined are drawn from a range of coastal zones; however, the paper does not – and could not – do justice to the enormous variety of cultures and coastal conditions relevant to this study. Notable omissions include consideration of Indigenous peoples in Africa and much of Asia. Instead the focus...
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Journal Article
Published: 01 November 2005
American Mineralogist (2005) 90 (11-12): 1705-1711.
... , 2 , 261 – 269 . Elen , S. ( 2001 ) Spectral reflectance and fluorescence characteristics of natural color and heat-treated “Golden” South Sea cultured pearls . Gems and Gemology , 37 , 116 – 123 . Erasmus J. , Cook , P.A. , and Sweijd , N ( 1994 ) Internal shell...
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Journal Article
Published: 18 April 2019
Journal of Sedimentary Research (2019) 89 (4): 293-309.
...John M. Rivers; Linso Varghese; Ruqaiya Yousif; Fiona F. Whitaker; Sabrina L. Skeat; Ismail Al-Shaikh Abstract The southern margin of the Arabian Gulf is a “classic” shallow-water, evaporative, carbonate-producing setting. The sediments and early diagenetic products creating the “Great Pearl Bank...
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Journal Article
Published: 01 July 2015
Journal of Foraminiferal Research (2015) 45 (3): 305-318.
...Tao Li; Rong Xiang; Tuanjie Li Abstract Benthic foraminiferal assemblages were studied in 327 surface sediments collected at water depths ranging from 2 to 100 m in the Pearl River Estuary and its adjacent continental shelf. A self-organizing map (SOM) was created to display the benthic assemblages...
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Series: Geological Society, London, Special Publications
Published: 01 January 2006
DOI: 10.1144/GSL.SP.2006.257.01.02
EISBN: 9781862395053
... with further here. To demonstrate applications of RM to the cultural heritage it is convenient to classify the examples according to some criteria. Here the cultural period (Prehistoric, Roman, Medieval, Renaissance, etc.) is not used as this paper is more mineralogical–technological than archaeological...
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