A Victorian Holbeinesque pendant

A Victorian Holbeinesque pendant, set to the centre with an oval cabochon-cut garnet measuring 18mm x 13mm, surrounded by six old brilliant-cut diamonds, set within yellow gold square collets alternating with green, blue and red enamel floral motif, suspending a natural pearl drop, to the reverse a glass locket compartment securing a plaited lock of hair, within a floral and scroll engraved yellow gold border, circa 1870, gross weight 13.5 grams