Song/Yuan DynastyExquisitely carved and pierced in openwork as a male Immortal with a cheerful expression riding atop the back of a dragon, holding on to its horns, the dragon with its head slightly raised, with bulging eyes, whiskers and finely incised beard and mane, the scales well-defined, with clawed legs, the tail curled back on its back, the stone of translucent and even white tone, box. 5.5cm (2 3/16in) long (2).