If the diamond is cut too shallow or deep it will lose light out the sides and bottom and will appear dull, with little sparkle. Diamond cuts can be graded as Ideal, Excellent, Very Good, Good, Fair or Poor. An Ideal cut will reflects nearly all light that enters the diamond. Ideal diamonds are very rare. A Very Good cut is still of superior, rare quality, this diamond reflects nearly as much light as the ideal cut, but for a considerably lower price.
Good cuts reflects most light that enters and is an excellent value.
A Fair cut will sparkle, but will not be as brilliant as a higher grade of cut. Finally, a Poor cut is a lifeless looking diamond. We do not recommend Poor cut gemstones for fine jewelry. The rule of thumb is, the whiter a diamond's color, the greater its value. However, this does not mean that lower color diamonds cannot be just as beautiful when they are cut well.