Beautiful Mid Century Sterling Earrings With Enamel~Stamped S925~Scandinavian?

Hello All,
I picked these up today at the library, they're having a jewelry sale/fundraiser for their new addition.
I went there on Monday to return a film that a friend had lent me and it happened to be the first day of their sale.
Over the past few days I've picked up some amazing pieces at extremely reasonable prices,( 1.00 to 40.00 )
These earrings were with the costume pieces and were priced at 3.00. The color of the blue enamel glowed among the other pieces on the table, and I flipped over the simple, elegant, design.
I didn't see a mark on them and the check out girl thought they weren't silver, but when I arrived home I looked with my loupe and to my delight discovered the mark S925.
They look 60's or 70's to me, and Scandinavian comes to mind.
Does anyone recognize the design or have a hunch as to who the maker might be?
Thanks!