A Russian diamond set gold and enamel brooch

A Russian diamond set gold and enamel brooch, C1900 centred with a diamond set Great Imperial Crown on oyster coloured guilloche enamel oval ground within a tied laurel two colour gold wreath. The shoulders millegrain set with graduated diamonds. Kokoshnick to rim. The pin with obscure mark, probably a Kokoshnik.

The Great Imperial Crown indicates that the brooch was probably a presentation piece.