Cameo History

A quick overview history of Cameo Glass:

Cameo Glass dates to the Ancient Romans and were produced in two periods; between around 25 BC and 50/60 AD, and in the later Empire around the mid-third and mid-fourth century.  The Portland Vase would be one of the most well known examples

https://en.wikipedia.org/wiki/Cameo_(carving)#Roman_glass_cameos

It fell out of practice but was revived in the 19th century largely through the efforts of Thomas and George Woodall.

An excellent summary can be found here:

http://www.glassassociation.org.uk/sites/default/files/WEBSITE%20CAMEO%20-.pdf