Blue Nile is an online jewelry store that has carved a niche as both an educator and retailer of diamonds and fine jewelry. It emphasizes the concept that choosing a diamond shouldn't be complicated. Therefore, in addition to its impressive array of loose diamonds and engagement rings, Blue Nile has comprehensive educational resources that provide valuable instruction and guidance on how to purchase fine jewelry.

There's no shortage of diamonds, engagement rings and wedding bands with Blue Nile. You can browse hundreds of loose diamonds as well as engagement settings. If you have something specific in mind, you can create your own custom piece; you select the diamond to set in your preferred earring, pendant or ring design. Blue Nile does not sell watches or corporate gifts, but it offers a variety of other fine jewelry, including pearls and gold, silver and platinum pieces.

Every diamond on the Blue Nile website is certified by either the Gemological Institute of America (GIA) or the American Gem Society Laboratories (AGSL). Blue Nile provides an official grading report with every loose diamond, so you know the exact quality and authenticity of any diamond you purchase through this jeweler.

As mentioned above, Blue Nile's flagship offering is its educational resources. The best jewelry websites offer some type of jewelry education, whether in the form of buying guides or how-to guides. But Blue Nile's education center far surpasses that of most competitors. The website provides in-depth articles on how to select diamonds and other precious gemstones. You'll also find articles on common precious metals, with information on their density, durability, and how to properly clean and care for them.

Blue Nile offers free shipping on all orders, but it only requires a signature upon delivery for orders of $1,000 or more, which can be risky if you have a piece of jewelry delivered to your door when you aren't home. You have 30 days to return or exchange an item with Blue Nile, but special orders and engraved items are exceptions to the rule.

Blue Nile offers extensive resources and a massive selection of certified diamonds. It offers free shipping on all orders, and it includes a grading report with each diamond you purchase.