If color is the key to their heart, give them this delightful multi-hued necklace. 10k yellow gold the key pendant features a heart-shaped head with a mix of round-cut stones including amethysts, lab-created emeralds, lab-created rubies, lab-created padparadscha sapphires, and blue and white lab-created sapphires 16- to 18-inch adjustable cable chain with lobster clasp