DIAMOND CUT 

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The cut of a diamond has the greatest affect on the brilliance and sparkle of a diamond (not to be confused with diamond shape). The way the diamond is cut determines the way the facets -the tiny internal mirrors in the diamond -are aligned to reflect light that comes in through the top of the stone.
The GIA grades cut by Cut (round diamonds only), Symmetry and Polish: Excellent, Very Good, Good, Fair and Poor. An ideal cut diamond will be 3EX or EX-EX-EX. 

DEEP CUT
A deep cut diamond will have a smaller face size (in the case of a round, this would be the diameter) and also will lose light out of the base of the diamond.

IDEAL CUT
An ideal cut diamond is the perfect balance between size and brilliance, with the most amount of light be reflected back out of the face of the diamond, giving maximum sparkle.

SHALLOW CUT
Shallow cut diamonds have a larger face, making them appear larger per carat weight. However this is at the price of some of brilliance, as light here too is lost out of the base of the stone.



Hearts and arrows

Hearts and arrows diamonds are the best of the ideal cut round diamonds - with perfectly aligned facets, perfect polish and symmetry. A Hearts and Arrows diamond will have the most brilliance and sparkle. The hearts and arrows terms refer to the shapes that appear under special lighting. From the top of the stone, eight arrows will appear and from the bottom, eight hearts. 

The hearts and arrows terms refer to the shapes that appear under special lighting. From the top of the stone, eight arrows will appear and from the bottom, eight hearts.


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