The Romans were slow starters with glass, and apparently didn't even have a word for it until about 60 BC. Augustus changed all that, importing skills and craftsmen wholesale: soon they were producing extraordinary stuff like cage cups, cameo glass and gold-band glass. Genuine ancient glass often acquires an attractive iridescent patina, which can now be reproduced without burying the glass for hundreds of years.
Glass work (Flash)inspired by that of ancient Rome is on display at the Getty. You can actually buy real Roman glass here.