Qianlong Of oval section, surmounted by two deftly carved mountain peaks flanking a canyon and detailed with delicately carved brushes, the seal face carved in positive seal script with a three-character inscription reading yiyun lou surrounded by two chi dragons, the stone of translucent creamy-white tone, the Imperial zitan box carved with the three-character seal face on the top and gilt infilled, Japanese wood box inscribed to the interior with a colophon by the Japanese scholar Kuroda Genji (1886-1957) . 5.5cm (2 1/4in) high (4).