Please help identify

There is no universal standard for grading pearls, unlike diamonds. So sellers can give the pearls they sell whatever grade they like.
A-AAA is the most common and accepted range, but some sellers use A-AAAA or even AAAAA.
It doesn't make their pearls better.

Ideally sellers should have a page on their website where they describe what the grades mean.

It's best to buy from vendors who have a reputation for selling genuine pearls. That being said, freshwater pearls are usually much less costly than saltwater pearls. If they are listed as freshwater, likely they are.
 
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