Keeping crystal energy close is easy - when it’s attached to your keys! 
Agate is known as a good luck stone. As a stone of harmony, one of the things agate does is balance yin/yang energy. Agate also increases energy, provides courage, emotional strength, self-confidence, and dispels fears. It can also lessen feelings of envy by grounding the emotions. Plus it helps you to stay calm when driving.
Note: Picture not indicative of actual product as each product in unique and varies in colour/style.