19th century blue enamel etoile ring

19th century blue enamel "etoile ring".
Beautifully made gold and guilloché enamel ring in the style of the 18th century.

Solid 18 carat gold ring model 'bague de firmament',  finely made in blue and white enamel and set with seven rose cut diamonds in closed (cut down) silver settings.
Measurements plaque 14,5 x 19,5 mm

Condition: the enamel has been restored (see photo). The ring and shank are in good condition