Blue Goldstone Stud Earrings

these are sure pretty! smaller than a penny, set in gold tone metal which may be vermeil. the blue and gold stone may be natural or synthetic I can't tell but the pearls appear to be faux. the inscription in the back is too small for me to read clearly but it does end in 925 so I'm thinking it might be vermeil, which is a term for gold-plated silver.