CLOCKWISE FROM TOP: White-gold, diamond, and rock-crystal bracelet by Lorraine Schwartz (price on request). Available at Bergdorf Goodman, 754 Fifth Avenue, 212-753-7300. Circa 1930s platinum, pearl, onyx, and diamond brooch by Coda Gems ($11,025). Visit codagems.com. Fox Trot watch by Van Cleef & Arpels ($240,000). Van Cleef & Arpels, 744 Fifth Avenue, 212-644-9500. Siegelson’s Art Deco diamond and rock-crystal pendant necklace by Mauboussin (price on request). Available at Bergdorf Goodman, SEE ABOVE. Platinum, diamond, black-onyx, and frosted rock-crystal pendant earrings by Fred Leighton ($28,000). Fred Leighton, 773 Madison Avenue, 212-288-1872. Pavé diamond and rock-crystal earrings by Ivanka Trump ($25,000). Ivanka Trump, 683A Madison Avenue, 212-756-9912.