Tiffany and co necklace Heart Key Charm. Heart key charm with round brilliant diamonds in 18k white gold. The item "Tiffany & Co.White Gold Diamond Heart Key Pendant Charm Necklace 18 Long" is in sale since Wednesday, June 26, 2019. This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Necklaces & Pendants\Diamond". The seller is "phonemateboutique" and is located in Fremont, California. This item can be shipped worldwide.