The brilliance and sparkle of a diamond is based on the cut and the better the cut, higher the shine and sparkle. When proper proportions are maintained while cutting the diamond, the light reflected from the top of the diamond is better and if the cut is too deep or shallow, light leaks from the sides.
The diamond is evaluated on the degree of colourlessness. Best quality diamonds are complexly devoid of all colours and expensively priced. Although most of the diamonds have a negligible colour component and grading is done from D to Z. Pale yellow is the most common colour manifestation in diamonds but high quality diamonds are completely colourless.
A natural gemstone, all diamonds have minute imperfections while diamonds that are graded as Flawless have no imperfections and are rare. The imperfections in diamonds are graded as Slightly Included, Very Slightly Included, Very, Very, Slightly Included and Internally Flawless.
The measure of the specific diamond’s weight is termed as Carat and it is considered based on the cut-grade and the length of the top of the diamond (in millimetres).