State Gemmological Centre of Ukraine (SGCU)

Scientific practical journal «Precious and Decorative Stones». 2020/N 1 (99)

ISSN 2079-1410

Y. Gayevsky, О. Belichenko. Complex gemological studies of a pearl/nacre doublet in antique jewelry

DOI: https://doi.org/10.53056/...

UDC 549.091+671.157

COMPLEX GEMOLOGICAL STUDIES OF A PEARL/NACRE DOUBLET IN ANTIQUE JEWELRY

Y. Gayevsky, chief specialist State Gemmological Centre of Ukraine 38–44 Deghtyarivska Str., Kyiv, 04119, Ukraine E-mail: gud@gems.org.ua

О. Belichenko, Ph. D. (Geol.), Head of the Department State Gemmological Centre of Ukraine 38–44 Deghtyarivska Str., Kyiv, 04119, Ukraine E-mail: lbgems@gmail.com

Language: Ukrainian

Precious and Decorative Stones, № 1 (99), 2020: 4-6

Abstract. The results of complex gemological studies of a pearl/nacre doublet insert in an antique jewelry item are represented. The main gemological characteristics were determined, microscopic study of the object was carried out, the semi-quantitative X-ray fluorescence analysis (EXDRF) and X-ray radiography methods were applied in the research.
It is possible to suggest by the results of the research that the authors deal with the rare marine cultured pearl as a compound of pearl/nacre doublet. The approximate age of this pearl considered as more than 100 years and it was possibly produced by "Mikimoto" company.

Keywords: doublet, marine cultured pearls, complex gemological studies, microscopy, X-ray fluorescence analysis, X-ray radiography.

(Recommended by К. Derevska, Dr Sc.(Geol.), Prof.)

References:

1. Diagnostics methods of precious stones and their substitutes with X-ray fluorescence analysis method use: approved by the order of SGCU from January 25, 2013, No. 6 / 13-1. Kyiv, 2013, 37 р.
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4. Karampelas St., Fatima Mohamed, Hasan Abdulla, FatemaAlmahmood, LatifaFlamarzi, SupharartSangsawong, AbeerAlalawi. Chemical Characteristics of Freshwater and Saltwater Natural and Cultured Pearls from Different Bivalves, 2019. Minerals 9 (6): 357.

Full text [in Ukrainian]