Diamond Shape


Choose Your Diamond Shape

Since all diamond cut styles are very different, unique characteristics determine quality for each shape. Select your preferred shape below and learn how to recognize the most beautiful diamond in that shape. If you have additional questions, feel free to contact one of our Diamond and Jewelry Consultants who can help you find the diamond shape that’s perfect for you.

Round Cut Diamonds Princess-Cut Diamonds Emerald-Cut Diamonds Asscher-Cut Diamonds Marquise-Cut Diamonds
Oval Cut Diamonds Radiant-Cut Diamonds Pear-Shaped Diamonds Heart-Shaped Diamonds Cushion-Cut Diamonds

Round-Cut Diamond

The round brilliant cut diamond is by far the most popular and most researched diamond shape available today. For almost 100 years, diamond cutters have been using advanced theories of light behavior and precise mathematical calculations to optimize the fire and brilliance in a round diamond. In addition to being the most popular and researched shape, round-cut diamonds will typically give you more flexibility in terms of balancing cut, color, and clarity grades while still getting the fire and brilliance you want.

To maximize the brilliance of a traditional round diamond, select one in the two highest cut grades, ideal or very good, and choose ideal, excellent, or very good polish and symmetry grades. For a round diamond with superior sparkle, consider an Astor by Blue Nile™

Princess-Cut Diamond

This is our most popular non-round diamond. Its beautiful brilliance and unique cut makes the princess-cut diamond a favorite for engagement rings. The princess has pointed corners and is traditionally square in shape. When choosing a color grade, consider that while the price of a J-color non-round diamond is exceptional, color may be slightly visible in its corners. Also, princess-cut diamonds can vary greatly in how square or rectangular they are. To find the dimension of princess you want, look for the length-to-width ratio in our interactive diamond search and on each diamond’s detail page. This will determine what the diamond will look like when viewing it from above. Here are length-to-width ratios for princess-cut diamond shapes that are pleasing to the eye.

Princess-Cut Width to Height Ratio

For a princess diamond shape that is square, look for length-to-width ratios between 1 and 1.05. If you prefer more of a rectangular shape, look for length-to-width ratios greater than 1.10. For a princess diamond with superior sparkle, consider an Astor by Blue Nile™diamond.

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