wholesale diamonds associated with harzburgites is about 3.3 billion years old -- more than two thirds the age of Earth itself.
The first step in manufacturing GIA Certified Diamonds is to give them to a cleaver or sawyer. They both, essentially, perform the same task: That is to cut--or cleave--the wedding ring in two pieces in order to bring out the best profile that will determine the end product of the stones.
One of the two principal fancy diamonds trade routes passed through Venice. It enjoyed a monopoly of the wedding ring trade on its way to the main towns of southern Germany up to its final destination in Bruges.