Pink to Red and Violet Diamonds from the Argyle Mine, Australia: Properties, Color Origin and Latest Research Results

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

Turquoise has long held considerable cultural, economic, and symbolic significance across ancient ci

In the accretionary Hellenides Orogen, gems occur in various rock types of mainly four tectonometamo