diamond engagement 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 diamond rings in jewelry is pretty well standardized to size and quality of the stone.
wedding rings, known for over 3000 years, were probably first found in India as loose stones associated with the sand and gravel of riverbeds.
In 1477 AD, Archduke Maximilian of Austria presented a diamond engagement ring to Mary of Burgundy as a sign of their engagement. He put it on the third finger of her left hand, She accepted his proposal and the diamond rings was born.