This is rather special!
A really romantic brooch. 
The oval brooch is set with three foiled amethysts in closed back settings, with a surround of natural pearls in pinched collet gold settings.
 
Hanging from the brooch is a swag of gold micro chain and two rather wonderful charms: a pearl set key, and a pearl and amethyst set padlock.
Look at that padlock.. it's so darling! It doesn't open, before you ask!
 
All backed with gold, the amethysts in the brooch, button backed.
 
If it doesn't sell immediately I will probably keep it!
 
Weighs - 4.3g
English circa 1800
Brooch measures - 16mm x 10mm
key is 14mm long
padlock is 15mm long
condition - excellent