Openwork gold bracelet with emeralds and missing beads, pearls probably. Is made of two parts joined with hinges, what makes it easy to put on. The hinge-clasp was closed with a pin (missing now). Roman, 5th century (?)
Pictures:
Goldarmband mit Smaragden http://www.rheinischemuseen.de/museum/DE-MUS-078919?region=p0019
https://www.bildindex.de/document/obj20385304/
https://www.bildindex.de/document/obj05712336?medium=mi01449c06
https://www.dw.com/en/roman-treasures-along-the-rhine/a-15978326
https://roemisch-germanisches-museum.de/download/Imageflyer_DE_WEB.pdf