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Is the pearl layer a reversed shell? A re-examination of the theory of pearl formation through physical characterizations of pearl and shell developmental stages in Pinctada margaritifera

Published online by Cambridge University Press:  24 November 2011

Jean-Pierre Cuif ,
Yannicke Dauphin ,
Lauren Howard ,
Julius Nouet ,
Stéphan Rouzière  and
Murielle Salomé
Jean-Pierre Cuif*
Affiliation:
UMR 8148 IDES, bât. 504, Sciences de la Terre, Université Paris Sud, 91405 Orsay, France
Yannicke Dauphin
Affiliation:
UMR 8148 IDES, bât. 504, Sciences de la Terre, Université Paris Sud, 91405 Orsay, France
Lauren Howard
Affiliation:
Natural History Museum, Cromwell Road, London, SW7 5BD, UK
Julius Nouet
Affiliation:
UMR 8148 IDES, bât. 504, Sciences de la Terre, Université Paris Sud, 91405 Orsay, France
Stéphan Rouzière
Affiliation:
UMR 8502, Physique des Solides, Bât. 510, Université Paris Sud, 91405 Orsay, France
Murielle Salomé
Affiliation:
ID21, European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France
*
aCorresponding author: jean-pierre.cuif@u-psud.fr
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Abstract

A series of physical characterization methods (UV fluorescence microscopy, X-ray microdiffraction, backscattered electron imaging and X-ray absorption spectroscopy) were applied to Polynesian pearls collected after different cultivation periods, varying from three weeks to eighteen months. Through this rigorous time-based sampling, 120 pearls produced by 20 different donor oysters were compared. Results show that the structure of the pearl layer can be understood as a sequence of distinct secretion processes whose progressive occurrence through time may lead to variously arranged and sometimes aberrant mineralized structures. By making comparisons with the structure and growth mode of the Pinctada margaritifera shell, this study shows that the currently accepted theory that views the pearl-bed as a “reversed shell” cannot account for the diversity of the microstructural patterns and mineralogical properties observed in the pearl layers. From a practical and economic view point, it appears that development of these pre-nacreous materials superposed onto a perfectly round-shaped nucleus is the main cause of shape irregularities in pearls and the consequent decrease in their value.

Keywords

Pearl-oysterPinctada margaritiferaBiocrystallizationMicrostructural sequenceOrganic matrix distributionLayered growth mode
Type
Research Article
Information
Aquatic Living Resources , Volume 24 , Issue 4 , October 2011 , pp. 411 - 424
Copyright
© EDP Sciences, IFREMER, IRD 2011

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