Cut grade dramatically influences the price of a diamond. A diamond that
has excellent cut proportions will reflect and show more light than a diamond that is poorly cut.
Symmetry refers to the facets of a diamond being all proportional and aligned. The more symmetrical the diamond, the higher its value.
It is a form of luminescence that refers to a blue or a violetish blue glow some diamonds reflect under a UV light. Blue is the most common colour of fluorescence, which occurs in diamonds, but yellow, green and white fluorescence are among the other naturally occuring colours. In fact, the famous Hope diamond exhibits a rare red fluorescence. Fluorescence is considered to be a flaw and the cause of flourescence in certain diamonds has an effect on the beauty, desirability and its value.
The Diamond Report attests to the quality of a diamond without estimating its value and is usually issued for the cut diamonds from 0.47 ct upwards. The report should indicate clearly that the graded stone is a natural diamond.