Woodbridge Antiques has dated this piece to the Edwardian era.
The locket is opened at the back where the framed glass is hinged (see images).

Iconic Edwardian design - very pretty! A rare item!
The locket is not marked but has been tested for Silver.
Condition: In lovely antique condition.
Measurements:
Height including bow at top: 2.8 cm approx.
Width: 2 cm approx.
Depth: 5.5 cm approx.
Length of chain: 52 cm approx.
Weight: 9.8 grams approx.
Woodbridge Antiques has dated this piece to the Edwardian era.
Specialists in quality antique silver, fine jewellery & accessories
You can view the stock and full dealer information on the Woodbridge Antiques Profile Page