These Auction Pieces Are Sure to Drive You Into a Frenzy

Circa-1925 Art Deco 70-ct. aquamarine briolette pendant set in platinum with diamonds and two fancy cut sapphires, plus black enamel decoration by Marzo (estimate: $80,000 to $160,000), Haughton International Fairs, October 17–23, 212-642-8572, haughton.com

Pair of Van Cleef & Arpels 18k gold flower brooches with round, oval, and cushion-cut sapphires and diamonds from the collection of Mrs. Paul (Bunny) Mellon (estimate: $25,000 to $35,000), Sotheby’s New York, November 20–21, 212-606-7000, sothebys.com

Circa-1901 Art Nouveau convertible chrysanthemum bracelets/choker in gold, carved glass, enamel, diamonds, and natural pearls by René Lalique (estimate: $500,000 to $700,000), Doyle New York, October 21, 212-427-4141, doylenewyork.com

Diamond, emerald, and sapphire flower brooch by Cartier (estimate: $70,000 to $100,000), Christie’s, October 22, 212-636-2000, christies.com

Van Cleef & Arpels Burmese ruby and diamond bracelet/choker with oval-cut ruby cluster links and brilliant-cut diamond borders (estimate: $100,000 to $200,000), October 7, Bonhams, 212-644-9001, bonhams.com