Corvidae Antique has dated this piece to the Victorian era.

Marked 9CT and JA&S.
In excellent antique condition with little sign of wear. The locket opens easily with a thumbnail and clicks shut securely.
Size: 2.3 x 2.7cm (including the bail). Total drop 3.5cm.
Weight: 4.4g.
Corvidae Antique has dated this piece to the Victorian era.
Hand picked jewellery from a friendly family business
You can view the stock and full dealer information on the Corvidae Antique Profile Page