Tiffany & Co. Elsa Peretti 18K Yellow Gold Pearl By the Yard Cultured Salt Water Necklace 28 Inches Toggle Clasp. Breakfast at Tiffany's, this iconic five strand pearl necklace Tiffany Labellov. Natural Pearl & Diamond Necklace, ca. Ziegfeld pearl necklace: In line with the collections modern tribute to the 1920s, this. Signed jewelry also topped the sale, with a stylist 18kt yellow gold “X†shaped clasp.