This is considered to be a major aspect and has its own importance along with all other characteristics.

All other factors being similar, a badly cut diamond can be worth less than half the value of a well made stone. The proportions of a stone as well as its polish and precision of faceting determine how much of the diamond`s potential fire and beauty is visible, determine its value. Better cut diamonds and near ideal cut stones command a premium at the consumer market. The diamond cut will definitely have its influence on the sparkle, fire and brilliance, as well as its perceived size and even, to some degree its apparent colour. maximization for the diamond`s brilliance. A finely cut diamond will reflect light.

Symmetry, polish, and faceting are the precisely visible features of a cut and would be given an importance to the percentages of the depth, height and angles. Light should enter and exit a diamond through the top facets. A cut that is too shallow or too deep reflects it through the bottom facets, and lets the light leak out of the bottom or side of the gem. Properly aligned facets means light will enter the diamond and reflect back through the large top facet,

Diamonds are not at all easy to mine. In fact, more than 250 tons of ore need to be blasted, crushed and processed to yield just one carat of rough diamond! And of all the diamonds mined, only about 20% to 25% are gem-quality; the rest will eventually be used for technological and industrial purposes, or as abrasives.