Grey Goose Martini Glasses

Found these beauties the other day; Grey Goose martini glasses, in an art nouveau style, with flowing lines and natural forms. I may not drink martinis (neither shaken, nor stirred), but these are very pretty.
They are a limited edition and were issued for the Grey Goose anniversary. I am not sure which one, I will have to do some more research.
Online they are listed as having pewter stems, but the way the patina looks on one of them, I am almost convinced that they are silver plated.