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

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

A.Y. Shelementyeva, Y.B. Shelementyev, O.V. Yarapova Download Pdf

In 1955, the first report on Thai diamond was made by Dr. Payome Aranyakanon, a renowned tin explora