When you purchase a piece of diamond jewelry from a retailer/jeweler, the price of the jewelry includes costs such as mining and cutting the diamond, the setting and craftsmanship of creating the piece, as well as retail business expenses. When you, as the owner, decide to sell that piece of jewelry, it’s important to keep in mind that depreciation has occurred.Additionally, the buyer of your piece may have costs to consider. The setting of the jewelry will normally be reduced to its metal weight value.