Pretty vase. Sorry no help is forthcoming but I'm interested to know what you manage to find out 
I looked up the initials but couldn't find a maker or glass master that might fit the G and ?Dv?
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Thanks for your comment. Yeah, the cricket noise has been overwhelming on this one. I think that "Dv" might actually be D......, maybe just a line for the rest of the letters in the last name, but that is just a guess. I will update this post if I ever find anything out about the artist. I have also posted to CollectorsWeekly and no one there has any ideas about the artist, either. Guessing there is probably a FaceBook group for Murano glass but I do not use FB.
kwqd