Agate

Transforms negative energy into positive energy / Enhances mental functions / Improves concentration / Enhances perception and analytical skills / Stress reduction / Serenity / Can help us get rid of inner anger and anxiety / Helps relationships become stronger / Security / Truth / Justice / Abundance / Love / Inspiration / Creativity / Spirituality.

Black Agate is also a protective stone.

You can program a crystal, which means asking its help with something specific of all that it can offer you. However, this is not mandatory. The crystal will help you anyway where the universe deems you need reinforcement or assistance. Basic condition of course is that you value it and believe in its power.