Quote History Quoted:
After doing a little research here's what I found out. There are no standards as to what grade A or grade B is. Why? Because there is no central agency or authority that determines grades of vanilla beans or allows what can be sold as this or that. It just doesn't exist. Bean marketers can call any beans grade A or B or whatever. It comes down to Caveat Emptor. If you're satisfied with the beans you get from your supplier then stick with them because the rules are made up as they go along.
View Quote
This is true but there is a general consensus among the big time buyers (middlemen and food manufacturers that are using real vanilla) on what each grade roughly is. Yes, it is their responsibility to inspect to make sure it meets their needs.
Some call them "extract grade" and "gourmet" instead if B and A. Generally they all mean the same thing.
Grade B/Extract grade is a bean less than 30% moisture that may have splits, short beans, etc
Grade A/Gourmet is a bean that is long, plump, not split, and has a moisture of 30-35%.