A blue agate heart is said to have many meanings and properties, including:
Stress relief: A blue agate heart can help you stay calm and collected in stressful situations by relieving stress in your mind, body, and spirit.
Emotional balance: A blue agate heart can help you overcome emotional outbursts, jealousy, possessiveness, and sentimentality.
Grounding: A blue agate heart can help balance your mind, body, and spirit