It's the little things that make Mervis Diamond Importers special: The company offers a 100% lifetime trade-up policy on all loose diamonds. You'll always have the opportunity to upgrade your center stone and you'll keep 100% of the value you originally paid. And because Mervis is true diamond importer they feature a massive selection of diamonds often at prices far below retail. As a third generation family business Mervis Diamond Importers conducts business the old fashioned way with honesty and integrity. Voted "Best Place to Buy a Diamond" by the readers of WashingtonPost.com Mervis has a reputation you can trust. As long-time partners with Verragio we work seamlessly together on all special orders making sure each ring is just perfect.