Protection: Agate has been believed to have magical powers and protect people from harm. 
Balance and harmony: Agate is known as the stone of balance and harmony. 
Emotional healing: Agate is said to bring emotional healing to the mind, body, and spirit. 
Self-confidence: Agate is believed to increase self-confidence and security. 
Good fortune: Agate has been associated with good fortune and spiritual protection. 
Birthstone: Agate is the birthstone for Gemini and May.