Filigree Butterfly 3 strand NECKLACE VINTAGE

Vintage 3 strand necklace that I got in a lot of vintage jewelry from an Estate Sale. There are no markings that I can find. It appears that the chains are sterling. And I think the clear stone may be a diamond or CZ. I have not had it appraised and I cannot guarantee that it is silver or that the stone is a diamond. The filigree butterfly seems to be high quality