Nitrogen aggregates in yellow HPHT and CVD synthetic diamonds

When it comes to the geographic origin of gems, curiously enough, historians sometimes put forward p

Stefanos Karampelas, Eloïse Gaillou, Annabelle Herreweghe, Ugo Hennebois, Farida Maouche, Romain Bo

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