AN ANTIQUE DIAMOND AND AGATE CAMEO RING, the marquise-shaped agate cameo of Diana with diamond surround to the plain hoop, mounted in silver and gold, circa 1880; an Edwardian pearl and diamond crossover ring, the pearl and diamond terminals with rose-cut diamond shoulders to the plain hoop, circa 1910; and a single-stone diamond stick pin, detachable to form stud, in fitted case