An early 19th century gold necklace

An early 19th century gold necklace, mounted with graduated oval-shaped tassie glass intaglios, with matching brooch and drop earrings, each with an interesting classical or mythlogical scene, the necklace with seventeen, the drop earrings each mounted with two intaglios joined with a pair of fine-link gold chains and a single intaglio to the brooch, all mounted in cut-down gold collets, all emulating a nicolo intaglio, the necklace centre intaglio 2cm wide, the brooch 2.5cm wide, necklace 36cm long, fitted case by T & J Perry, Regent Street