Gems in Hellenistic and Roman Jewellery of Northern Greece: An investigation from the Collections of the Archaeological Museum of Thessaloniki, Greece

Emerald is the green variety of beryl, with its distinctive color resulting from trace amounts of ch

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

Synthesis methods to produce large and high-quality dia- mond for jewellery have been improved over