4th or Heart Chakra
If you have issues with love, balance, accepting yourself or others, intimacy or grief, then this would be an area to be working on. Associated colors: green and/or pink. Located near center of chest at your heart.
The healing art of placing stones on or near Chakra centers is widely accepted in Crystal Healing, Reiki, Massage Therapies, Ayurvedic and Yoga practices all over the world.
In using a green and pink/red together, I have found good results in encompasing the minor Chakra of the Higher Heart which acts as a bridge between the lower and upper Chakras by opening the access to higher spiritual realms.
The 4th Chakra is about love and acceptance. This is where we access our compassion and acceptance of ourselves and others, are provided with a healthy immune system, feel our peace in this life and where our balance comes from.
When In Balance...
We are compassionate, warm, accepting, and are comfortable in relationships and intimacy.
We can be codependent, become clingy or jealous in relationships, have poor boundaries, be demanding and martyr like in our self-sacrifices.
We may suffer from loneliness and isolation, be intolerant of ourselves and others, be judgemental, have a fear of intimacy and relationships or have a lack of empathy.
Healing the Chakra...
As in the preceding three Chakras, it is important to reconnect with our body when out of balance here. Adding green vegetables or dark leafy greens to the diet can help. Explore breathing exercises, journaling as an aid to self-discovery, allow the release of grief and find forgiveness when appropriate. Physical ailments rooted in this Chakra can include coronary artery disease, heart attack, hypertension, chest pain, asthma, lung cancer, back or shoulder problems or breast problems including cancer.
Stones to Use: Amazonite, Rhyolite, Labradorite, Green Aventurine, Ruby in Zoisite, Green Jasper or Malachite. Additional crystals that could be used are Green Actinolite, Apophylite, Bloodstone. Emerald Calcite, Chrysocholla, Chrysoprase, Dioptase, Emerald, Fuschite, Jade, Green Kunzite, Green Kyanite, Moldavite, Moss Agate, Peridot, Rhodochrosite, Rhodonite, Green and Watermelon Tourmaline or Unakite.
Note: When using gemstones for healing, the energy should be directed through the body flowing from Earth to Sky or Sky to Earth, depending on what is to be worked on. For this Chakra, drawing from sky to earth is very beneficial. But, always keep in mind that there is no "right" or "wrong" way if the good that is brought helps you to realize your wholeness.