A jewelry with securely nested changeable decorative elements having a main decorative element, optionally one or more auxiliary decorative element, securely fitted on a base ornament. The auxiliary decorative element, when present, is trapped between the main decorative element and the base ornament, the main decorative element and the optional auxiliary decorative element are securely nested and locked with the base ornament; and the main decorative element and the optional auxiliary decorative element get unlocked by a common action by a pointed tool. The main decorative element and auxiliary decorative element look integral to base ornament, that is, as if the jewelry is single piece jewelry.