Ca. 600 AD.A gold finger ring of a flat-section hoop with wide, supportive shoulders. The bezel is set with an amethyst intaglio engraved with Chi-Rho, one of the earliest forms of Christogram, formed by superimposing the first two (capital) letters — chi and rho (??) of the Greek word ??????? (Christos) in such a way that the vertical stroke of the rho intersects the center of the chi. The item has undergone X-ray fluorescence analysis to confirm the metallurgical content suggesting its ancient origin and lack of modern trace elements.Size: D: 16.5mm / US: 6 / UK: M; 8g.Provenance: Private UK collection; From an old Oxford collection formed in the 1990s; Ex. Swiss private collection.