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

Fancy colour diamonds that derive their colour from nitro- gen-related defects (such as N3/N2 center

Purple jadeite, renowned for its distinctive purple hues and rich cultural connotations, is highly a

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