How to sell my engagement ring? To help unravel the mystery of the selling engagement ring diamond, here are some tips to consider before pawning his stone. Unlike gold, which has a value of from quantitative, the resale price of a diamond engagement ring has no objective measure; making selling an engagement ring is not easy for inexperienced marketers are confused and overwhelmed. To help unravel the mystery of the selling engagement ring diamond, here are some tips to consider before pawning his stone.