When you put your hard-earned money in, you want to make sure you are investing in the real thing. Blue Nile is the biggest online shop for certified diamonds. However, Blue Nile is not only known for diamonds but also for pearls, gold and platinum as well. You can buy loose stones or design one for yourself through the various stones and setting selections available in their site or just pick from one of their styles. Surely, you won't be disappointed.