Figure 7. UV-Vis-NIR reflectance spectra of GIA 02 before (blue) and after (red) treatment showed major spectral differences in the 405 nm region.
Figure 5. DiamondView fluorescence images of a naturally colored pistachio pearl (top left), a naturally colored dark gray pearl (top right), and treated Tahitian cultured pearls BA 06 (bottom left) and GIA 02 (bottom right) showed distinct differences in fluorescence intensity under identical experimental conditions. Images by Kyaw Soe Moe.
Figure 6. UV-Vis-NIR reflectance spectra of BA 02 before (blue) and after (red) treatment showed major spectral differences in the 405 nm region.
Figure 4. Microscopic images on the white blemish areas of treated pistachio pearls GIA 01 (left, field of view 2.0 mm) and GIA 02 (right, field of view 2.7 mm) did not reveal any dye concentrations. Photomicrographs by Sally Chan.
Figure 3. The bodycolors of the 12 samples modified by Ballerina Pearl Co. before and after treatment show the changes produced by the processes. Top row: BA 01–BA 04; middle row: BA 05–BA 08; bottom row: GIA 01–GIA 04. Photos by Sood Oil (Judy) Chia.
Figure 2. Eight natural-color pistachio pearls ranging from 9.70 × 9.40 mm to 15.00 × 12.30 mm, produced by black-lipped pearl oysters, were examined in this study. Photo by Sood Oil (Judy) Chia.
Figure 1. A graduated strand containing 43 yellowish green (“pistachio”) bead-cultured pearls produced by black-lipped Pinctada margaritifera and treated by Ballerina Pearl Co. The cultured pearls range from 9.13 to 10.80 mm. Photo by Sood Oil (Judy) Chia.
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