Emerald is effects to mind, which means it increases memory, intuition, communication and intelligence. In addition it enhances eyesight, body vitality, and immune system. It is useful in decreasing pain, cancer, asthma, ulcers, infections, childbirth pains, eyestrain, stress, paranoia, schizophrenia, radiation effects, acidity, headache, back pains, sciatica, and female diseases. The effects are achieved as emerald balances the breathing system, nervous system, circulation, nerves, haemoglobin, adrenals, and pancreas.
Green Emerald is precious stone for Mercury. The semi Precious substitute for this is Peridot.