An exceptionally rare pale green jade imperially-inscribed 'luohan' boulder

An exceptionally rare pale green jade imperially-inscribed 'luohan' boulder
Qianlong six-character mark and of the period
Masterfully carved in varying levels of relief with a luohan seated cross-legged in a craggy grotto next to a incense burner on a ledge, wearing a pleated robe with his right hand holding a ruyi sceptre and left hand with an alms bowl, surrounded by a gnarled pine, wutong and willow trees rendered in intricate details, all beneath an incised forty-one-character inscription, the reverse carved with a pavilion amidst jagged rocks and trees, the underside with an incised Qianlong six-character mark and two additional characters yin and si (four), box. 22.3cm (8 3/4in) high (2).