Princess cut diamond rings

Accredited Gem Appraisers (AGA) and American Gem Society Lab (AGSL) are the only two bodies that currently offer official quality grades on princess cut diamonds.  For AGSL you are looking for a 0 to be the highest grade EX from the AGA.  You want to be looking for a depth of 65%-75%, table of 61%-68% and a crown height of 11%-16% for the highest quality princess cut diamond rings.  If you find these characteristics, expect to pay a heavy premium, but it will be well worth it for an engagement ring type purchase.  Be sure you are fully versed with the AGA and AGSL standards before reviewing any quality of princess cut diamond.