Actually, it depends on the type of diamond rings that you have. In case you have an antique ring that is generations old, it will not be a good investment option. This is because the factors that were considered to determine the quality of a diamond ring decades ago will not be the same now. When you sell such diamond rings, you will hardly get the money that was spent on it many years ago. However, most diamond jewelers offer 100% resale value for their diamonds these days. If you are lucky enough, you will get more than you spend depending on the demand for the rock that you own. If you ask are diamond rings a good investment in keeping all the financial reasons apart, it will definitely be a yes. Since diamonds are the hardest gemstones on Earth, you can cherish it for a lifetime, and its beauty will never fade just like the love in your relationship. In fact, that is one of the main reasons why a diamond ring is gifted to propose.