A gold, onyx and enamel locket brooch, late 19th century

A gold, onyx and enamel locket brooch, late 19th century, designed in the Archaeological Revival style, set with a banded onyx cabochon, within a band of gold rope twist and outer border of white enamel roundels with smaller onyx cabochons at the cardinal points, the reverse with a glazed compartment containing a lock of hair, suspending an onyx cabochon pendant, length 5.3cm