Leslie Hindman Auctioneers announces a three-day spring auction of Fine Jewelry and Timepieces, the house’s largest to date at nearly 1,300 lots on April 18-20. The prominent private collection of Mary N. Porter of Fort Lauderdale, Florida will lead the auction. The highlight of her collection, a Hammerman Brothers 18 karat yellow gold necklace and earrings, contains 285 round brilliant cut diamonds and 40 cultured pearls (estimate $15,000 to $20,000). An Oscar Heyman Brothers ring containing an emerald cut diamond weighing 2.10 carats and an emerald cut emerald weighing 2.40 carats is expected to sell for $10,000 to $15,000. In all, 235 lots will be offered from Miss Porter’s personal collection.