Tiffany & Co. 18k Yellow Gold Heart Key Pendant And Necklace. Comes with Pouch. Designer: Tiffany & Co. Hallmark: "T&Co. 750" (pendant)/ "Tiffany & Co." "750 Italy" (necklace) Composition: 18K Yellow Gold Necklace Measurement: 18" in length Pendant Measurement: 1" in length Necklace Weight: 4.4 grams Condition: Excellent estate condition, ready to wear Location: Perry Street 122156405337