Zodiac gemstones are also known as Astral stones. The word Astral is derived from Astrology and has been an important part of holistic beliefs for centuries. Astrology is not a science but was created originally as a method for telling time. It is used to tell us when one time has passed and also to let us know when another is coming, essentially acting as the calendar for the universe. You can also buy Gemstones according to Zodiac signs online in India.