NDLI: 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

Content Provider	EDP Sciences
Author	Jean-Pierre Cuif Yannicke Dauphin Lauren Howard Julius Nouet Stéphan Rouzière Murielle Salomé
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.
Ending Page	424
Starting Page	411
Page Count	14
File Format	HTM / HTML PDF
ISSN	09907440
Alternate Webpage(s)	https://www.alr-journal.org/articles/alr/abs/2011/04/alr110050/alr110050.html
e-ISSN	17652952
Issue Number	4
Journal	Aquatic Living Resources
Volume Number	24
DOI	10.1051/alr/2011149
Language	English
Publisher	EDP Sciences
Publisher Date	2011-10-01
Access Restriction	Open
Rights Holder	© EDP Sciences, IFREMER, IRD 2011
Subject Keyword	Pearl-oyster Pinctada margaritifera Biocrystallization Microstructural sequence Organic matrix distribution Layered growth mode Pearl-oyster / Pinctada margaritifera / Biocrystallization / Microstructural sequence / Organic matrix distribution / Layered growth mode
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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