Among all the 4Cs, cut is the most important quality and should be given top priority. This is followed by carat, clarity and color. For cut grades, always go for GIA or AGS certifications as their grading is the most recognized and accepted in the jewelry market.   

For GIA certification, the bottom line of the cut grade is “Very Good“.
As for AGS, the bottom line cut grade is “Excellent“.

While the next higher grade for either certifications can present a noticeable difference, we highly advise you to please not go below the bottom line.

Note: Since all online retailers has its own definition of cut grades, the grade shows up on websites may not be the same as the GIA/ AGS certification. It is advised to double check the specs on the ceritification before any purchase.

See also tutorials on diamond cut.