Warring States PeriodThe angular plaque delicately carved with slightly-raised geometric lines depicting a mythical beast mask, the translucent and smoothly polished stone of light yellow tone, 3.1cm (1 1/4in) long; together with two jade ornaments comprising a pale green jade bead in the shape of a rectangular tube, incised with eight characters in seal script on each side; and a bead in the shape of a turtle shell, the greenish-yellow stone mottled with russet inclusions, the larger bead 3.5cm (1 1/2in) long. (3).