The heart chakra is associated with the color green but also the secondary color pink. By now you've learned how to cleanse and purify your crystals. The stones green jade, green calcite, green tourmaline, green aventurine, peridot, emerald and rose quartz. These stones promote health and healing and provide tranquility to the spirit. Rose quartz has been used for centuries to promote love and fertility.
For balancing your heart chakra I recommend wearing your stones or crystals in a necklace and keeping the energy literally close to your heart. I also recommend meditating with the crystal in your hands or on your chest (while lying on your back) to fully absorb the energy.