The largest online retailer of diamonds and fine jewelry. Free FedEx shipping and 30-Day returns on every order. At Blue Nile, our philosophy is simple: Offer high-quality diamonds and fine jewelry at outstanding prices. When you visit our Web site, you'll find extraordinary jewelry, useful guidance, and easy-to-understand jewelry education to help you find the jewelry that's perfect for your occasion. Since its founding in 1999, Blue Nile has grown to become the largest online retailer of certified diamonds. We offer thousands of certified diamonds which can be used to create diamond engagement rings, earrings, and pendants.