Journal
GEMS & GEMOLOGY
Volume 42, Issue 4, Pages 222-235Publisher
GEMOLOGICAL INST AMERICA
DOI: 10.5741/GEMS.42.4.222
Keywords
-
Categories
Ask authors/readers for more resources
Treated cultured pearls with a chocolate coloration have entered the market from several sources. Gemological, spectroscopic, and chemical analyses were performed on both untreated and treated cultured pearls to provide a better understanding of the chocolate treatment process that is used by one company (Ballerina Pearl Co.) and to determine how these products can be identified. It is likely that the organic components in black cultured pearls were bleached to create the brown coloration; no foreign coloring agent was detected. Cultured pearls treated by this method can be identified based on their unusual coloration, characteristic fluorescence, UV-Vis-NIR reflectance and Raman spectra, and trace-element composition.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available