After a loose diamonds has been found it goes through many processes before it becomes the finished product we are familiar with.
ideal cut diamonds in jewelry is the most popular of all gemstones. The price of it and rarity is carefully monitored by the major diamond cartels. As a result the price of wholesale diamonds in jewelry is pretty well standardized to size and quality of the stone.
Remember, all diamonds are not created equal. Two diamonds of equal Carat Weight may vary substantially in price due to their Cut, Colour and Clarity. The carat weight of diamond wedding ring is a very important determining factor in their value.