Clockwise, from top left: Fine olive Wyoming nephrite in the form of a horsechestnut hull, without spines, 1 7/8" high; Golden brown Siberian nephrite flat scallop shell, 2 ½" diameter; Comma form in pale Siberian nephrite with brown clouds, 1 5/8" high (sold); Thinly carved abalone shell form in fine dark olive Wyoming nephrite, 2 1/8" high.