A diamond is likely the most valuable piece of jewelry you own. But selling it might cause you embarrassment. At Trade In My Diamond, you can get cash for your diamond, AND still keep your jewelry AND NOBODY WILL KNOW! If you no longer want your diamond jewelry, you can sell it for fast cash with Trade In My Diamond. Our company features a one-of-a-kind diamond trade-in program. We’ll buy it and replace your diamond with a free, brilliant moissanite stone. Moissanite is a lab-created stone that is indistinguishable from a natural diamond and nearly as hard as diamond, so it’s suitable for everyday wear.