Individuals born between April 21 and May 21 come under this star sign. The birthstone for April is Diamond and for May is Emerald. Both the gemstones have their own unique characteristics which are supposed to affect the person wearing them. Diamond, apart from being one of the most precious stones known to mankind, also has some other properties which can positively impact the person wearing it. It signifies bonding, prosperity and energy and is supposed to be a detoxifier which explains its use to counter poison. It is also believed to cure certain brain and eye ailments apart from being helpful in fighting allergies. Emerald, a variety of the mineral beryl, is green in color due to presence of Chromium. It is the stone of love and symbolizes loyalty and friendship. Among its healing properties are its positive effect on health problems relating to spinal cord and muscular system. It is also supposed to improve vision and help improve infertility and diabetes.