Giving someone the key to your heart this Valentine's Day? This cute necklace should help! A rose gold plated sterling silver heart key necklace with a genuine diamond. The heart key pendant measures 1.4cm by 5mm by 1mm and features a genuine diamond. The 18 inch long chain has a curb height of 1mm and fastens with a secure lobster clasp. Arriving in our cute craft style gift box, ready to go.