welcome to the GMB

I suppose if nothing else this might do for storing your spaghetti - it looks tall enough

Amethyst is a lovely colour, and yes you're right, it could be Murano though I've no idea if that is true, but we have many experienced folk here and fingers crossed someone might be able to help with an id.
In the absence of any marks or labels on your glass, then an attribution is down to someone recognizing this design/colour, which can be an unpredictable process, unfortunately.
As we're not professional appraisers of vintage or antique items, regret we don't discuss values, which may seem unhelpful but such matters are very much a personal opinion and a dozen different people would probably give you the same number of different values. Auction sites can be a useful source of possible values - and speaking to antiques professionals is worthwhile.
Let's see what other people can offer in the way of help.