Three cups tea coffee white and gold porcelain of Paris Empire 19th century

Three hemispherical cups on pedestal with raised handle, new shape of the empire era. White porcelain gilded with fine gold. Two identical cups in perfect condition, the third has a slight difference in size as well as a slight wear in the gilding and the presence of some clusters of ferrous oxides (tiny black spots) related to the kaolin technique in the 19th century. Cup dimensions: drinking 8.2 cm. The two identical cups are 5.5 high, the third 5.2 cm.