Van Cleef & Arpels Gold, Carved Amethyst, Coral, Green Chrysoprase, Black Onyx and Diamond Duck Clip-Brooch, France 18 kt., the floating duck with coral beak and carved coral neck and wing, carved amethyst and green chrysoprase body and carved black onyx wings, set with 20 round diamonds ap. .45 ct., accented by a small round cabochon emerald eye and tapered black onyx crown, signed VCA, nos. B 1473 15, with maker's mark and French assay mark. C