Cut grade is the biggest factor in determining the general appearance of a diamond as a shoddily cut diamond will seem dull even with perfect clarity and color. Conversely, a well cut diamond can have a faintly lower color (G-H) or clarity (SI1-SI2) and still look rather striking, thanks to its expert ability to bring sparkle and brilliance.
Cut grade offers a single rating which includes a range of factors, making it an easy but fundamental tool in assessing a diamond. A frequent mistake is to look into these singular factors instead of banking chiefly on the Cut grade, which already takes everything into account. Only in comparisons of two diamonds of similar Cut grade must the individual Cut components be used as to further refine 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.
Lessons Learned About Fashions
An Extremely Thin girdle is more prone to chipping, and accordingly should be avoided for a diamonds that is meant to be set in a ring. Earrings or pendants are not as exposed to rough contact and thus are not as likely to chip around the girdle too. 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 get a Princess Cut diamond with a Very Thin girdle, set it in a design where the corners are protected.
If a diamond has a polish grade of Excellent to Good, any polishing imperfections will not be seen by the naked eye and make no bearing on the overall look of the gem. For diamonds having clarity grades of 1 or less, even a polish grade of Fair is satisfactory, given that these diamonds already keep internal inclusions that are detectible to the naked eye, reducing the relevance of any polish markings . For diamonds below . Poor is the single polish grade that ought to be avoided, no matter the gem’s size or clarity.
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 with its judicious bearing on appearance, symmetry has a considerable impact on price; a diamond that has Excellent Symmetry and Polish may be 10%-15% more expensive 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.