wedding ring 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 antique engagement ring in jewelry is pretty well standardized to size and quality of the stone.
The first thing to decide when purchasing a wedding rings is the shape of the stone. There are nine major shapes of diamonds.
Most loose diamonds are over three billion years old, two-thirds the age of the Earth. There are a few "youngsters", though, which are only 100 million years old.