Gemstones have been used for centuries for their beauty as well as their purported astrological, therapeutic, and spiritual effects. Gemstones recommended by date of birth are believed to have unique properties that can affect the physical, emotional, and spiritual well-being of the wearer. Choosing the right gemstone can be a difficult task, but with a little knowledge of astrology, you can make an informed decision. Gemstone recommendation is a process in which an astrologer recommends a gemstone to a person based on his birth chart or personal needs.