GIA Certified Diamonds associated with harzburgites are about 3.3 billion years old -- more than two thirds the age of Earth itself.
The first step in manufacturing diamond wedding ring is to give them to a cleaver or sawyer. They both, essentially, perform the same task: That is to cut--or cleave--the diamond earrings in two pieces in order to bring out the best profile that will determine the end product of the stones.
Up to the fourth century, wedding ring was known only in it rough, or crystalline forms. It came in a variety of shapes, the most common being the octahedron. This was a crystal with eight faces, resembling two pyramids joined at their bases.