First, I agree with Anne, this is not a Sommerso piece of glass, so it is SNAD, or significantly not as described.
Secondly, I have some very colorful pieces of Italian glass in those colors... None of it "glows" like the pictures.....
Third, and I may sound like a broken record here, but use Paypal, use a credit card on Paypal and never your Paypal balance of funds, and then if there is any hesitation on the part of the seller or Paypal/ebay to back you on the return, dispute the sale through the credit card and they will almost immediately reverse funds and investigate. If you tell the credit card company it is not what the pictures looked like, and it is not a Sommerso piece, they will have you return ship it and it is a done deal.
Ebay is not really out to protect you... they are out to protect themselves. Your seller may or may not be concerned with you being happy..... Your credit card company cares deeply about what you buy online using their money.... Paypals credit agreement with the card companies requires them to accept chargebacks from credit card companies.... and those go straight through Paypal to the seller.... Paypal can not really contest them at all....
Craig