A CARVED WHITE AND BROWN JADE BOULDERCHINA

The four characters on the front reads: 'Chi Bi Ye You' ('Travelling along the Red Cliff at night').
The back is incised with a famous poem written by Su Dongbo (1036-1101), entitled 'Nian Nu Jiao - Chi Bi Huai Gu', which may be translated as 'Remembering the Red Cliff, to the tune of Nian Nu Jiao'.