Stuart Kingston gemologists recommend selecting the highest cut grade within your budget. The reason is simple: of the Four Cs, no other characteristic has a greater influence on a diamond's appearance.

  • Cut is a diamond's most important characteristic.
  • It has the greatest overall influence on a diamond's beauty.
  • It determines what we generally think of as sparkle.


A diamond's cut grade is an objective measure of a diamond's light performance, or, what we generally think of as sparkle. When a diamond is cut with the proper proportions, light is returned out of the top of the diamond (which gemologists refer to as the table). If it is cut too shallow, light leaks out of the bottom; too deep and it escapes out of the side.

Cut Grades

Stuart Kingston Signature Ideal cut: Our most brilliant cut, representing roughly the top 1% of diamond quality based on cut. The highest grades of polish and symmetry allow it to reflect even more light than the standard ideal cut.

Ideal cut

Represents roughly the top 3% of diamond quality based on cut. Reflects nearly all light that enters the diamond. An exquisite and rare cut.

Very good cut

 Represents roughly the top 15% of diamond quality based on cut. Reflects nearly as much light as the ideal cut, but for a lower price.

Good cut

Represents roughly the top 25% of diamond quality based on cut. Reflects most light that enters. Much less expensive than a very good cut.

Fair cut

Represents roughly the top 35% of diamond quality based on cut. Still a quality diamond, but a fair cut will not be as brilliant as a good cut.

Poor cut

Diamonds that are generally so deep and narrow or shallow and wide that they lose most of the light out the sides and bottom. Stuart Kingston does not carry diamonds with cut grades of poor.

What Cut Grade Is Right For Me?

For the best possible cut, look to the Stuart Kingston’s Diamond Collection. Custom made exclusively for Stuart Kingston, each diamond is hand-selected and cut to the most exacting standards, guaranteeing one of the finest cuts available in the world.

Diamonds with a cut grade of good or very good represent an excellent combination of beauty and value.

Now that you have a solid understanding of how cut affects a diamond's light performance (or sparkle), learn about the second of the Four Cs, color.




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