Amber from the Thanbaya Gaing Coal Mine, Minbu Township, Magwe Region, Myanmar

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

A newly observed variety of faceted transparent brown sapphire has recently entered the gem market,

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