Application of Fibre Optics Reflectance Spectroscopy (FORS) for the determination of mineral pigments in jasper

Performing a literature search is a very important—but often neglected—part of doing gemmologica

Determining the geographic origin of yellow sapphires plays a critical role in the gem trade, as ori

Cultured pearls with a ceramic nucleus (bead) represent a new type of saltwater cultured pearls that