Welcome to the Glass Message Board Alice77.
Sorry but we usually shy away from valuations here, not really the purpose of this forum, prices can fluctuate from day to day and it can be a problematic providing valuations. Looking at past auction results can give you a rough idea of what similar items can sell for, it is far from an exact science.
In terms of finding information about them your best bet may be contacting the company directly, the contact page on their website:
https://www.simonecenedese.it/contactsPlease let us know of anything that you do learn, fabulous looking set you have there.
John