 For Mervis Diamond Importers, this is Ronnie Mervis. My friends ask me, what's better, natural mined diamonds or lab-growns? Natural diamonds were formed by nature during volcanic eruptions which occurred deep underground millions of years ago, and their value will increase over time. Lab-growns are formed by technology. At Mervis Diamond Importers, we offer both. Our trained experts will explain the difference and recommend what's best for you. Either way, you will receive the finest diamonds and value.