Three early 19th century hardstone-set watch keys

Three early 19th century hardstone-set watch keys, the first yellow gold wirework watch key with double-sided agate swivel seal, 6cm long, the second designed as a carnelian spherical bead with ornately chased gold mounts with split ring, 5.8cm, the third chased in bi-colour gold, containing an oval white chalcedony plaque within a bi-colour gold cased mount, 7.5cm