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Cut is how well the diamond is cut or “faceted”. While nature determines a diamond's colour, clarity, and carat weight, the hand of a master craftsman is needed to release its fire and beauty. The cut gives each diamond its unique sparkle and brilliance by allowing the maximum amount of light to enter and reflect back out of the diamond. A beautiful cut diamond will show a dazzling interactions of brilliance, fire and scintillation.

Two diamonds with the same color and clarity properties will still look very different if one diamond is cut excellent and the other one is cut poor. To judge a diamond’s cut, a diamond professional will look at the proportion and finish.
Proportion is about the interrelationship of angles and measurements of a polished diamond. Finish is about the quality of the polish and the precision of the cut. Although all diamond cutter wants to cut a diamond with the ideal proportion, it is not always possible. A diamond rough crystal is formed by nature and thus its form is usually far from ideal. A diamond cutter needs to make a choice before she or he cuts a diamond rough crystal to cut into a finished diamond: Will she or he cuts the largest diamond that she or he can from the rough crystal or will she or he cut the brightest and most brilliant diamond that she or he can?
If the diamond cutter goes for the largest cut diamond, the diamond will sacrifice some brilliance. If the diamond cutter goes for the most brilliant, the diamond will sacrifice some size. The more brilliant diamond is smaller but is valuable because it is so brilliant. The larger diamond is valuable because it is large, but is worth less per carat because it is not so brilliant. This trade-off is, besides the skills of the diamond cutter, one of the main reason why diamonds are not always cut into ideal proportions.
A large diamond that is cut ideal can be considered extremely rare and very valuable.

INSERT IMAGE: IDEAL CUT, SHALLOW CUT, DEEP CUT DIAMOND

more info >>The 4 C's Evaluated


 
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