I just did an image search for "veritable opaline murano" and there is a diamond shaped dish/ashtray, black with copper aventurine, part of the Avventurina range by V Nason if anyone knows what I mean by that, and it looks to have the label mentioned here, "Veritable Opaline Murano" with the letter N.
Trouble is, it's a small thumbnail, and when I click it, the page that it is on has updated, and the pic is no longer there. I've had a quick look around but been unable to find it, and have to go out now. Just thought I'd mention it in case it helps, as it would confirm that this label is actually a V Nason label.
This link *might* show it :X:: [Link