
At Blue Nile, it's their goal to help you learn about diamonds and jewelry,
so you can make the best choice.
1. First, learn the four "C"s of diamonds.
2. Choose between 18k gold or platinum for the setting.
3. Choose from solitaire settings or settings with side-stones or gemstone
detailing.
4. Determine whether the ring should be a surprise, or something you
choose together.
5. Trust your instincts.

If you are interested in receiving an extensive diamond-buying guide from Blue Nile, enter your email at the bottom left portion of their homepage.
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Blue Nile makes it easy to evaluate and choose a diamond. Because diamonds are appraised and graded according to a common set of criteria called the four "C"s, finding a quality diamond can be a straightforward process. Blue Nile offers guidance to help you prioritize these and other criteria so that you select the diamond that best suits your needs. Remember, it isn't necessary to purchase the ring with the diamond already set. Find the best loose diamond for you and place it with the band you want. Below is a sample from the Blue Nile Buyer's Guide.

Diamond cut is graded according to proportions of height, width, and the diameter of the top facet (or table). There are five grades of cut: ideal, very good, good, fair, and poor. If you're looking for a diamond with eye-catching sparkle, remember - the better the grade of diamond cut, the more brilliant the diamond.
 The perfect diamond has no color at all. Diamond color is graded on a letter scale, D through Z. When gemologists began grading diamonds, they reserved the A, B, and C grades for diamonds with less color than those they were currently evaluating. Little did they know, a D grade diamond was the highest grade of color they would find. Diamonds with less color allow more light in, creating more sparkle.

 There are 11 grades of clarity based on the placement and number of inclusions, or imperfections, inside the diamond: FL, IF, VVS1, VVS2, VS1, VS2, SI1, SI2, I1, I2, and I3. Flawless (FL) and internally flawless (IF) are the highest-end in diamond clarity — so rare and expensive that they are not commonly worn in jewelry. The inclusions in SI2 and I1–I3 grade diamonds may be visible to the naked eye, distracting from the beauty of your diamond.
 Diamonds are measured in carats, or a portion of weight. Larger diamonds are found in nature much less frequently than smaller stones, and for this reason, are generally more valuable. A two-carat diamond of a given quality is always more expensive than two one-carat diamonds of the same quality. The deciding factor in selecting the perfect diamond should be what characteristics are most important to you.
The deciding factor in selecting the perfect diamond should be what characteristics are most important to you. Blue Nile offers education and guidance in choosing diamonds, as well as a selection of exceptional high-quality diamonds.
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