Crystals can help with depression in a variety of ways. Removing negative emotions and thoughts with a grounding crystal is a primary way. Adding in feelings of love and increasing the ability to love is another. Changing how one thinks to change their life into how they deeply want is another.
Black tourmaline is a must have crystal for anyone suffering from depression. It will not only help remove negativity built up within, it will also protect from the negativity and toxicity of others.