Hi Stefan

Maybe this will be useful:

P. Cosyns 2011; The production, distribution and consumption of black glass in the Roman Empire during the 1st - 5th century AD. An archaeological, archaeometric and historical approach, Proefschrift ingedient tot het behalen van de academische graad van doctor in de Archeologie en de Kunstwetenschappen, Vakgroep Kunstwetenschappen en Archeologie Faculteit Letteren en Wijsbegeerte, Vrije Universiteit Brussel, Brussel.

http://www.academia.edu/2046608/Roman_black_glass

Best Regards

Maciej Wawrzczak

Dear Maciej,

many thanks for your tip. The ring I'm dealing with is type B4 in figure 57 in the book of Cosyns, and I'm confident to find there references to further findspots.

Best regards,

Stefan Wenzel

They seem to follow a Latène tradition and remind also rings made of jet as they are frequent in Britannia.

It would be interesting to work on Latène tradition in crafts (i think also but less in deities, buildings and personal names) like rings, brooches, pottery in the late second an during the third century in the provinces situated along the Rhine.

Dear Stefan,

we also found this type of ring in the Roman Villa Borg (Saarland). Picture of the ring and more information can be found on the Digicult-Website (http://saarland.digicult-museen.net/objekte/digi_einzBild.php?pi=916_1988-1890&s=1&volltext=Fingerring&suchart=0&page=2&suce=).

Best regards

Bettina Birkenhagen

Dear Bettina,

many thanks for your tip. The web page for the specimen from Borg contains useful references. Although only glass workshops from the 4th century are mentioned there for Trier, there might have existed precursors elswere in the town.

Best regards,

Stefan Wenzel

Dear Zrinka,

many thanks for your papers, especially for the first one. It is interesting that most of the bracelets of glass or jet from Split date to the 3rd to 5th century AD and not in the centuries following on the La Tène period. And the reference to the glass and jet workshop in Trier is useful to me.

Best regards,

Stefan