Elsa Peretti Heart Necklace Tiffany Co. in 18k Yellow Gold.  This delicate Tiffany Co. heart necklace was designed by Elsa Peretti and finished in 18 karat yellow gold. The necklace measures 16 inches in length and features a dainty little chain holding a beautiful polished heart slightly askew. This would be a fabulous gift to a special person in your life!