Buyers often confuse diamond cut with the shape of a diamond, such as round, oval, pear. However, the cut refers to the proportions and symmetry of the stone and how its facets effectively transmit light as it sparkles intensely. Precise workmanship and artistry are required to craft a stone to its perfect proportions and polish so that it delivers and transmits light magnificently.
Compared to any other feature, the splendor of a diamond depends more on its cut. Though difficult to ascertain and quantify, the three principal effects of diamond cut include, brilliance – the illumination created by the combination of the white light reflected from both inside and surface of the polished loose diamond; fire – those flashes of colors owing to the dispersion of light in many hues of visible spectrum; and scintillation – the sparkles when either the light source or the diamond is moved.
Diamond Cut: The Most Crucial of the 4Cs
The Gemological Institute of America (GIA) has invented the 4Cs of Diamond Quality – Cut Grade, Clarity Grade, Color Grade, and Carat Weight, and the 4Cs have been established as the cornerstone for judging the qualities of a diamond. To define the cut grade of any typical round brilliant diamond – the most common cut dominating majority of diamond jewelry – the proportions of the facets are calculated as these facets influence the face-up appearance of a diamond. These proportions help evaluate how the diamond will interact with light to garner desirable visual impacts of brightness, fire, and scintillation.
The GIA cut grade also accounts for the craftsmanship and design of the diamond, including the symmetry of facet arrangement, the type of polish on the facets, girdle thickness of the diamond, and its relative weight to the diameter.
Cut Grade and Carat Weight
At Diamond Exchange NYC, our diamond cutters face a tough task of balancing an optimal cut affecting its appearance against the maximum yield when fashioning the diamond from the rough. As most customers prefer to pay higher for a fair-cut larger wholesale diamonds, compared to a well-cut yet slightly smaller diamond, the diamond cutter is under pressure to sacrifice appearance instead of weight. Hence, the cut grade is even more important as it allows the buyer to identify the diamonds that are cut Poor to Fair in an effort to gauge carat weight.
Diamond Cut Ratios
The proportion of a diamond refers to its correlation between shape, size and the angle of every facet of the stone. A varied range of combinations can be achieved, eventually determining a diamond’s interaction with light. Any well-proportioned diamond has each of its facets properly angled and placed to maximize the light reflected back to the top or crown of the diamond and ultimately into the eye of the observer. This reflection is perceived as fire, brilliance, and scintillation.
Grading the Diamond Cut
The diamond’s Cut grade considers and calculates different factors to provide a single rating that weighs this combined impact on the diamond’s visual presentation. Therefore, it is a vital tool to evaluate the quality of a diamond and the primary consideration of a purchaser when buying a diamond.
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