The cut of a diamond has the most effect on its sparkle, or brilliance. Even if the diamond has perfect colour and clarity, a poor cut can make a diamond look dull. Blue Nile carries only the highest grades of diamond cut, for the most sparkle. Learn how to choose the right diamond cut with the most brilliance for your budget.

Diamonds with very little colour are the most highly valued and are priced accordingly. A little colour can diminish a diamond's brilliance. To help you choose the most brilliant diamond, Blue Nile offers diamonds with the ighest grades of colour. Learn how to choose a diamond with no colour noticeable to the unaided eye.

Diamonds with few flaws, or inclusions, are very rare and highly valued. Clarity is graded based on the number, location, size, and type of the inclusions found in a diamond. Blue Nile has some of the clearest diamonds available. Learn how to choose the right grade of clarity for your diamond.

The weight of a diamond is measured in carats. Since larger diamonds are more rare than smaller diamonds, diamond value tends to rise exponentially with carat weight. Read more about carat weight and learn how to balance diamond quality with the size of your diamond.