Pre WW2 Jewelry

First item is a pearl necklace, both items waere given to me by my grandmother (she was born in Germany before WW2) who they were also passed down to. The back has some kind of stamp and "585". Unsure of gem within the pendant part. Has anyone seen this or know who it was made by?

Second Item is a ring, unsure of gem, it has a stamp (very hard to read) either says "333" or "335". Has another seen this or know who it was made by?

 Would love any feedback.