In years of Practice, recommendation and results we have observed that the best alternative for emerald for harnessing the powers of Mercury is Peridot. Peridot is the gemstone of Mercury. It is the substitute gem for natural emerald. The name ‘evening emerald is just a euphemism that traders use. It is NOT an emerald. According to the ancient discipline of Vedic astrology, it is used for harnessing the powers of favourable Mercury in the birth chart.