Emerald is stone for mercury, this planet is significator of intellect, speech, memory, short travels, wisdom, intuitive power. It shows one?s mentality, analytical power and generous nature. It makes one scholar, searcher of mysticism of learning. A person whose mercury is benefic for him can be a good politician and intellectual. But a person whose mercury is malefic will be liar, gambler, boastful, conceited, talkative, cheat, unprincipled and inconsistent. Person with weak and malefic mercury will face health diseases like stammering, imperfection of speech or tongue, defects in memory or intelligence.