Inlaid plate of a continental composite brooch

Gold brooch or mount. Diam. 2.45cm. Fragmentary brooch or pendant or mount, flat top of sheet gold with beaded wire border, short vertical side of sheet gold with beaded wire collar around bottom, made of disc and strip soldered together - joint in strip at side visible. Hollow inside, no base-plate. On top gold cloisonné cells, 2 have rivets, 2 rivet holes behind. At centre a rectangular one set with flat opaque green glass, around it lozenge-shaped triangular cells alternating, set with flat garnets on plain(?) gold foil. Wires show considerable wear.