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Cut

Cut determines the interaction between light and the diamond, and this interaction determines the diamond's brilliance, and fire. When light strikes a diamond, some of the light is reflected back in the form of white light. This is called brilliance. If the diamond is too shallow, much of the light escapes out the bottom. If the diamond is too steep the light escapes out the sides. Both scenarios negatively affect brilliance.

Diamond Cut
Some of the light entering a diamond results in colored flashes called fire. Fire is the separation of white light into the spectral colors. Well cut diamonds display wonderful sparkle. This is best observed under incandescent lighting.

Various proportions of a diamond interact with each other to form the diamond's overall appearance. These measurements are all combined to achieve a cut grade of excellent, very good, good, fair, or poor.

Excellent 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: This includes all diamonds that do not meet the performance standards of a fair cut. These diamonds are generally deep and narrow or shallow and wide and tend to lose most of the light out the sides and bottom. MazzaFina Jewelry does not carry diamonds with cut grades of poor.

Finish
Diamonds are also graded on their polish and symmetry, collectively known as the diamond's finish. Polish describes the condition (or smoothness) of the surface of the diamond facets. The symmetry refers to the precision and alignment of the diamond's facets.