The gemological characteristics of yellow seawater bead-cultured pearl farming in Beihai City, southern China.

In this study, we comparatively investigated the gemological and fine-microstructural characteristics of yellow seawater pearls cultured in Pinctada fucata martensii using X-ray computed microtomography (μ-CT) analysis, ultraviolet-visible (UV-Vis) reflectance spectroscopy, field emission scanning electron microscope (FE-SEM), Raman and photoluminescence (PL) spectroscopy, and Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Detection of the nacre thickness indicated that the average nacre thickness varied from 0.17 to 1.