Speaking of Birthstones by month, for people born in May and belonging to the sun sign of Taurus i.e. between April 20 and May 20, Emerald is the traditional birth stone. Deep green is the color associated with this birthstone. Emerald stands for virtues such as friendship, faith and loyalty. It is known to cure health problems related to eyes, reproduction and spine. It is also known to bring relief from headaches and enhance a person’s mental capability.