Generally speaking, the best quality is AAA, while AB is rather low quality.
AAA > AA > A+ > A > A- > AB+ > AB
The photos shown in our catalog are for your reference. It may be top grade or medium grade.
The stones are graded from mass production, we try our best to select the most similar on one card/ pack. Please understand there is variation among one card/ pack because of the nature of natural stones.