Gold and Hardstone blackamoor Cameo Habillé Necklace, circa 1860

The gold chain necklace decorated centrally and at the clasp with 5 hardstone cameos of blackamoors in profile, their jewels and hair ornaments embellished with rose-cut diamonds, the frames set with cushion-shaped rubies, the central pendant cameo with glazed locket compartment on reverse, length 14 inches, several diamonds deficient.