Neolithic Period, the ornament Hongshan CultureConsisting of two circular bi discs with a round aperture at the centre, both unadorned and smoothly polished, the larger disc of olive-green tone and the other of greenish-yellow tone, the larger disc 9.6cm (3 3/4in) diam.; together with a pale green jade ear ornament of thick oblong form with a narrow slanting slit, the stone partially suffused with buff colour, 5.4cm (2in) long. (3).