Located in the center of the chest. The 4th chakra governs our ability to give and receive love. Stress, emotional pain caused by bad memories and overthinking can block this chakra. Green & pink gemstones such as Rose Quartz, Amazonite, Chrysocolla, Pink/Green Aventurine, Green Agate and Malachite open and enhance your heart chakra. Practice gratitude. Keep a gratitude journal, writing down three things a day that you feel grateful for. Pink represents the higher Heart Chakra.