A pearl identification challenge

Nicholas Sturman, Laura M. Otter, Artitaya Homkrajae, Areeya Manustrong, Nanthaporn Nilpetploy, Kwanreun Lawanwong, Promlikit Kessrapong, Klaus Peter Jochum, Brigitte Stoll, Herman Götz, Dorrit E. Jacob

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Nacreous pearls are usually found in saltwater (SW) or freshwater (FW) environments, yet there are some reports of pearls originating from a brackish environment. Likewise, nacreous pearls may form naturally or by human manipulation (bead and non-bead cultured), but in some cases the origin is hard to prove and professional opinions are not always unanimous. Two pearls were examined by the authors, who were in the unique situation of being unable to positively identify either their origin (natural or cultured) or growth environment (FW versus SW). This in turn had a direct impact on the ability to determine which mollusk produced the pearls, a factor that would have helped answer the former two questions. It is very rare to find pearls for which all three of these criteria are in doubt, as usually it is straightforward to determine at least two of them. The results of this study illustrate the challenges that laboratories sometimes face when testing pearls.
LanguageEnglish
Pages229-243
Number of pages15
JournalGems and Gemology
Volume55
Issue number2
Publication statusPublished - 2019

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Sturman, N., Otter, L. M., Homkrajae, A., Manustrong, A., Nilpetploy, N., Lawanwong, K., ... Jacob, D. E. (2019). A pearl identification challenge. Gems and Gemology, 55(2), 229-243.
Sturman, Nicholas ; Otter, Laura M. ; Homkrajae, Artitaya ; Manustrong, Areeya ; Nilpetploy, Nanthaporn ; Lawanwong, Kwanreun ; Kessrapong, Promlikit ; Jochum, Klaus Peter ; Stoll, Brigitte ; Götz, Herman ; Jacob, Dorrit E. / A pearl identification challenge. In: Gems and Gemology. 2019 ; Vol. 55, No. 2. pp. 229-243.
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abstract = "Nacreous pearls are usually found in saltwater (SW) or freshwater (FW) environments, yet there are some reports of pearls originating from a brackish environment. Likewise, nacreous pearls may form naturally or by human manipulation (bead and non-bead cultured), but in some cases the origin is hard to prove and professional opinions are not always unanimous. Two pearls were examined by the authors, who were in the unique situation of being unable to positively identify either their origin (natural or cultured) or growth environment (FW versus SW). This in turn had a direct impact on the ability to determine which mollusk produced the pearls, a factor that would have helped answer the former two questions. It is very rare to find pearls for which all three of these criteria are in doubt, as usually it is straightforward to determine at least two of them. The results of this study illustrate the challenges that laboratories sometimes face when testing pearls.",
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Sturman, N, Otter, LM, Homkrajae, A, Manustrong, A, Nilpetploy, N, Lawanwong, K, Kessrapong, P, Jochum, KP, Stoll, B, Götz, H & Jacob, DE 2019, 'A pearl identification challenge', Gems and Gemology, vol. 55, no. 2, pp. 229-243.

A pearl identification challenge. / Sturman, Nicholas; Otter, Laura M.; Homkrajae, Artitaya; Manustrong, Areeya; Nilpetploy, Nanthaporn; Lawanwong, Kwanreun; Kessrapong, Promlikit; Jochum, Klaus Peter; Stoll, Brigitte; Götz, Herman; Jacob, Dorrit E.

In: Gems and Gemology, Vol. 55, No. 2, 2019, p. 229-243.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Otter, Laura M.

AU - Homkrajae, Artitaya

AU - Manustrong, Areeya

AU - Nilpetploy, Nanthaporn

AU - Lawanwong, Kwanreun

AU - Kessrapong, Promlikit

AU - Jochum, Klaus Peter

AU - Stoll, Brigitte

AU - Götz, Herman

AU - Jacob, Dorrit E.

PY - 2019

Y1 - 2019

N2 - Nacreous pearls are usually found in saltwater (SW) or freshwater (FW) environments, yet there are some reports of pearls originating from a brackish environment. Likewise, nacreous pearls may form naturally or by human manipulation (bead and non-bead cultured), but in some cases the origin is hard to prove and professional opinions are not always unanimous. Two pearls were examined by the authors, who were in the unique situation of being unable to positively identify either their origin (natural or cultured) or growth environment (FW versus SW). This in turn had a direct impact on the ability to determine which mollusk produced the pearls, a factor that would have helped answer the former two questions. It is very rare to find pearls for which all three of these criteria are in doubt, as usually it is straightforward to determine at least two of them. The results of this study illustrate the challenges that laboratories sometimes face when testing pearls.

AB - Nacreous pearls are usually found in saltwater (SW) or freshwater (FW) environments, yet there are some reports of pearls originating from a brackish environment. Likewise, nacreous pearls may form naturally or by human manipulation (bead and non-bead cultured), but in some cases the origin is hard to prove and professional opinions are not always unanimous. Two pearls were examined by the authors, who were in the unique situation of being unable to positively identify either their origin (natural or cultured) or growth environment (FW versus SW). This in turn had a direct impact on the ability to determine which mollusk produced the pearls, a factor that would have helped answer the former two questions. It is very rare to find pearls for which all three of these criteria are in doubt, as usually it is straightforward to determine at least two of them. The results of this study illustrate the challenges that laboratories sometimes face when testing pearls.

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Sturman N, Otter LM, Homkrajae A, Manustrong A, Nilpetploy N, Lawanwong K et al. A pearl identification challenge. Gems and Gemology. 2019;55(2):229-243.