Diamonds, engagement rings, wedding bands and other fine jewelry are high-consideration purchases that many consumers prefer to make in a physical store. In our digital age, however, a distinctive website and online store showcasing high-end diamond rings, necklaces, earrings and bracelets is essential for a jeweler to drive sales. That’s been the case at Israel Diamond Supply, a diamond and jewelry retailer in Tulsa, Okla., that sells at wholesale prices and is one of the largest privately owne...