The listing, Dainty Sterling Silver Dangling Butterfly Ring has ended.
From a paper ring chart, this looks like a size 6. It has the lettering "Sterling" on the inside. The dangling butterfly itself is about 1/2" X 1/2". Though the butterfly dangles, it is all one piece. The jump ring does not have a slit in it. The ring has an groove on the inside of the back of the ring. It looks like perhaps it was sized or something, because the silver is a little uneven in the back. I believe this is a vintage piece. Very cute though! USA shipping only.