Articles of jewelry, including ring assemblies (100, 300, 400, 700, 1300) permitting secured, removable, rotatable, placement of rings within such ring assemblies (100, 300, 400, 700, 1300). In some embodiments, an ornamental support structure (412, 712, 715, 1312) comprises a hinge permitting a rotatable movement of a portion of the ring assembly to permit placement of the ring structure. In other embodiments, pinch clasps (520, 620, 820, 920, 1020, 1120, 1220, 1320) are used for such ring assemblies.