An enamel and pearl locket

An enamel and pearl locket, late 19th century, of oval outline, the front and bail applied with black enamel, centring on a star motif set with half pearls, the reverse with a glazed compartment, containing a photograph, mounted in gold, length 6.8cm including bail, pearls untested, one pearl replaced with a simulant, fitted case stamped Folkard & Son, Brighton