A lot of people when it comes to diamond jewelry, you have folks who believe that an engagement ring is not a worthy investment.       Diamond Rings Have Definitive Value The value of something can be determined by a number of factors, including demand and supply. One other way you can get the value of a diamond though is through an appraisal. This is a documentation by experts, which arrives at the rough retail value of the stone.   Appraising engagement rings is useful especially if you have insurance. So if the items are lost, stolen, or damaged, the insurance company will look at the appraisal before giving you a replacement of equal value. Moreover, the insurance company also figures out the premium on the value of the appraisal. Other than that, a 0.5 carat diamond eternity ring also has personal value to the owner.