Unique vintage clip on POISON EARRINGS

I have never seen earrings like this! Poison rings yes, but never earrings. Embrace your inner Lucrezia Borgia! Excellent vintage condition. Tests as sterling but I suspect the tiny stones may be glass. Super intricate handmade granulation and wirework. The tiny hinges are in perfect condition and the containers open easily and snap shut securely. There is a tiny hallmark on each clip but I can't make it out.