Oh, gosh, sorry - I was sure I'd replied to this thread.
Sue, I see what you mean about it being fumed. From memory, it's not quite so iridescent as that, though. The colours are also quite broken up. I'll dig it out again next time I have chance, and double-check. Nice vases, though!
I did have a look for G&P glass, but nothing leapt out in my searches. The closest I've come is, today, spotting a millefiori vase much in the style of Bucella Cristalli and bearing identical applied putti.