Emerald helps strengthen the immune system. This stone therefore has the power to fight against viral diseases such as the flu or angina pectoris. It also calms the digestive system and purifies the liver and pancreas, preserves the joints and protects the spine. It acts on heart problems, which is why it is recommended for convalescents to help them regain strength. It is a stone known for its toning and fortifying properties. People with epilepsy can also benefit from emerald's calming properties. At sight, this stone acts with great efficiency. For example, it can help relieve cataracts.