Guide to Diamond Cuts
The cut of a diamond will considerably affect the stone’s overall appearance. Cut grade ranges from Poor to Ideal, and measures a diamond’s reflective qualities—generally thought of as brilliance. A cut with correct proportions will mean that light is returned out of the top of the diamond. A cut that is too shallow or too deep will cause light to seep out of the bottom of the diamond, or flow through its sides.
Note: A diamond’s cut is different than its shape. The shape of a diamond refers to its actual outward appearance (e.g., round or princess).
Grading System for Diamond Cuts
Poor: Cut is deep and narrow, or shallow and wide, resulting in most of the light escaping out of the sides or the bottom. Appearance of the stone may seem dull.
Fair: Cut allows only some of the light to escape out of the sides or the bottom, resulting in reduced perception of brilliance.
Good: Reflects a large amount of light that enters the diamond, resulting in average brilliance and sparkle.
Very Good: Reflects most all of the light that enters the diamond, resulting in superior brilliance and sparkle.
Ideal: Reflects nearly all of the light that enters the diamond. A rare cut that results in exquisite brilliance and sparkle.