Non-Bead-Cultured Pearls from Pinctada margaritifera
April 30, 2018
A new report from GIA's Bangkok laboratory, "Non-Bead-Cultured Pearls from Pinctada margaritifera," examines a set of 120 NBC samples stated to be of Tahitian origin. Internal structures were examined using real-time microradiography (RTX) and X-ray computed microtomography (µ-CT). The authors also recorded the samples' UV-Visible, Raman, and photoluminescence (PL) spectra.
The results appear to indicate that these NBC pearls were cultured in Pinctada margaritifera mollusks, or at least were formed from mantle that incorporated the genes of this mollusk. The authors note that the various spectra and internal structures recorded in the study will provide valuable reference data on NBC pearls.