Diamond is the gem of Venus i.e. the lord of it is Venus. It is also a rare rattan. There are many references about diamonds in ancient texts of India. Meaning- what is a diamond, what is it like, where are its properties and defects are found and in which areas it can be used. Diamonds had been recognized and used in India since ancient times. Nowadays its circulation has increased a lot. It has different names in different languages. In Sanskrit it is known as Indramani or Vajramani in Hindi and Diamond in English. Cucumber is also called Ratanraj, because it is the best among other gems due to its quality, form and use. From a scientific point of view, diamond is the most rigid. It can neither be spent nor pulled by any other substance. For this reason, the light entering inside it returns completely, that is, there is complete reflection of light. Therefore, the brightness of diamonds is higher than other gemstones. Since ancient times, the desire to acquire knowledge about diamonds remains awake in the human heart.