A solid blue openwork jasper cover, meant to sit on top of a dessert dish. The white floral garlands are made from white jasper which is pressed into a mould and then applied. It would have been a very difficult piece to make.
This type of openwork cover is known as a croquant and it would have been used during the dessert service. It would have been placed over a dish of sweetmeats. Sometimes, covers like this would have been made from confectioners paste or spun sugar. A Wedgwood croquant could be used many times and still look attractive.