http://www.mardisjewelry.com 949-470-9500. Mardis Jewelry is the best jewelry store and custom design jeweler for Newport Beach. Mardis offers a prime selection of diamonds, jewelry exchange, wedding rings, engagement rings, luxury watches, bracelets, earrings, on site jewelry repair, jewelry appraisals, cash for gold and diamonds and more. Mardis is also an official Philip Stein store.