Double stranded faceted blue & yellow stone silver tone toggle clasp necklace

This is an absolutely gorgeous double stranded faceted blue & yellow stone silver tone toggle clasp necklace. The stones vary slightly in color and tone. I’m not sure what they are made of, perhaps blue chalcedony and lemon agate. The shorter strand is 16 and the 17 inches long. The toggle clasp is made of silver tone metal. In excellent vintage condition.