VINTAGE STERLING SILVER CLEAR & YELLOW CRYSTAL/STONE CLIP ON EARRINGS

Vintage sterling silver cross over entwined bands ring. 2 bands have clear stones - may be CZ or crystal - I don't think they are diamond. The top band has channel set black faceted square stones - I don't know what they are. The inside is stamped 925 and there seems to be a maker's mark, but I can't make it out. It looks like the number 200 in script or the word "zoo," but I can't be sure. See the close up picture. Minor scratches from wear. In very good preowned condition. I am delcluttering my late grandmother's collection.