Diamond Cut

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Buying Tips

  • Cut is the most important of the 4Cs because it has the greatest influence on a diamond’s sparkle.
  • Even if a diamond has a perfect clarity and color grade, if it has a poor cut, it may appear dull.
  • When diamond cuts are made with the proper proportions, light is returned out of the top of the diamond (which gemologists refer to as the table). If the cuts are too shallow, light leaks out of the bottom; too deep and it escapes out of the side.
  • To maximize your budget, choose the highest diamond cut grade your budget allows. We suggest a cut grade of Very Good or better.
Light Reflection of Diamonds

Grading Scale

Use the slider to see cut grade details or view the Cut Grade Chart below.

Astor by Blue Nile™
Astor by Blue Nile™

Every Astor by Blue Nile™ Diamond is cut to gather and reflect the most light possible. Light performance is measured by three factors: brilliance, fire and sparkle. Fewer than 15 out of every 10,000 diamonds qualify as an Astor by Blue Nile™ diamond.

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