An amethyst, chalcedony and enamel vinaigrette, first half 19th century

An amethyst, chalcedony and enamel vinaigrette, first half 19th century, of rectangular section with carved floral borders in gold, the lid set with an inverted cushion-shaped amethyst, the interior compartment with a hinged openwork cover designed as pansies, applied with multicoloured enamel, the base set with a white chalcedony, measuring 2.8 x 2.3 x 1.5cm