What does the Nox read it as? I don’t think it’s jewelry because of the flat round spot on the back, (rests flat as if for flush mounting), the motif, (looks like a window curtain) and the large sized hole. And it would hang at kind of a goofy position if it was on a chain..I’m thinking it was from furniture. Maybe a dresser, decorative, hole for the drawers knob. Half of it, anyway.. you might find the other half yet...