The Roman glass items I've seen have been glass. Nice glass, too.
A quick Google turns up this link
http://www.glassonline.com/history.html
which starts glasmaking in around 1500BC (maybe 300BC
for beads)
Glass *blowing* was used by the Romans. And they had
glass windows.
And it just carries on from there, with some
interesting plot and trade bits that can be borrowed
:)
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