These gorgeous necklaces, bracelets and other accessories are made by Alkhemia from what appears to be wire and polymer clay. Also I see that the artist uses some gems and beads as well. Unfortunately I cannot read Italian but I was able to navigate the artist's webpage with the help of trusty Google translate.
Please visit the artist's site, because the small snippet of her work that I am able to post here really does not due the justice to the sheer volume and creativity of this person. She also offers many tutorials of her work. You can also see some of her work on Flikr.
If someone is able to find more information about the artist, I would love to know and include here.