An Arts and Crafts opal and mother of pearl pendant necklace

An Arts and Crafts opal and mother of pearl pendant necklace, circa 1900, and a pearl, enamel and diamond ring, the necklace of scroll design, set with sections of mother of pearl and cabochon opals, to a fancy link chain with T bar clasp, pendant length 7cm, necklace length 44.5cm; the ring set with a pearl measuring 8.8mm, within a gold mount accented with rose-cut diamonds and applied with blue enamel, size P, stamped K18, pearl untested