An approach to understanding the factors in the emerald enhancement clarity grading system used at CDTECGemlab

Over the past several years, the market for pink-coloured rose quartz has been augmented by variants

In recent years, an increasing number of sources of fei cui, such as Guatemala, Italy and Russia, ha

For many, fossiliferous tree resin, primarily amber, gained wide visibility to the public in 1993 wh