Cut grade is the most vital factor in determining the whole form of a diamond for a badly cut diamond will seem dull even with exceptional clarity and color. In contrast, a well cut diamond can have a considerably lower color (G-H) or clarity (SI1-SI2) and still look pretty stunning, owing to its notable ability to produce sparkle and brilliance.
Cut grade offers a single rating which combines an assortment of factors, making it a straightforward yet crucial tool in valuing a diamond. A usual mistake is to focus on these separate factors instead of depending mainly on the Cut grade, which already covers all of them. Only upon comparing two diamonds of the same Cut grade are the individual components of Cut to be treated as further refinements in your search. That said, below are these individual factors and some tips:
Any Medium culet size or smaller will be imperceptible to the naked eye, and make no negative impact on the look of a diamond.
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An Extremely Thin girdle is more inclined to chip, and therefore must be avoided for diamonds that will be set in a ring. Because earrings and pendants are not as exposed to rough contact, they are not as likely to chip around the girdle as well. Even Very Thin girdles in Princess Cut diamonds should be avoided, as this shape already comes with sharp corners that make chipping more probable. If you do buy a Princess Cut diamond with a Very Thin girdle, try setting it in a fashion that protects the corners.
Diamonds with an Excellent to Good polish grade will have invisible polishing flaws, if any, and have no effect on the general appearance of the gem. For diamonds whose clarity grades are 1 or lower, even a polish grade of Fair is adequate, in view of the fact that these diamonds already have internal inclusions that are discernable to the naked eye, making any polish markings not as relevant. For diamonds that are less than . Poor is the only polish grade that must be avoided irrespective of the clarity or size of the diamond.
For diamonds that have a symmetry grade of Excellent to Good, symmetry is not to be used as a main factor in selecting them, because each of these grades can be expected of diamonds of excellent appearance. Symmetry is more crucial in diamonds with VVS2 Clarity and higher, as the very refined defects coming from Fair or Poor symmetry (which can look a lot like pinpoint inclusions), would impede the diamond’s otherwise unblemished appearance.
Even though it makes a small effect on appearance, symmetry has a weighty impact on price; a diamond with Excellent Symmetry and Polish can be 10%-15% pricier than one with Good Symmetry and Polish. Finally, as diamonds with Poor symmetry have imperfections that are visible to the naked eye, they must be avoided completely.