FROM LEFT: Circa 1970 coral, onyx, diamond, and mother-of-pearl necklace by Bulgari (price on request). Available at Siegelson, 589 Fifth Avenue, 212-832-2666. Platinum, diamond, and coral earrings by Stephen Russell ($25,000). Stephen Russell, 970 Madison Avenue, 212-570-6900. White-gold earrings with gray mother-of-pearl, onyx, and diamonds by Cartier ($32,800). Cartier, 828 Madison Avenue, 212-472-6400. Bugatti coral and onyx pendant with diamonds by Wempe ($28,000). Wempe, 700 Fifth Avenue, 212-397-9000. Gold, enamel, platinum, and diamond brooch ($36,900) and gold, enamel, platinum, and diamond cuff ($50,000), both by David Webb. David Webb, 789 Madison Avenue, 212-421-3030. Black onyx and diamond ring by Le Vian ($3,300). Available at Kay Jewelers, 136 West 34th Street, 212-594-1898.