Considering bride is the star of the ceremony, the Bride should wear the biggest and prettiest pearls. Her pearls must express her individuality and personality also the wedding tone. She must also select the highest quality pearls possible; preferably those with a rating of AAA.
In the end though, what actually matters is how the person feels about the particular piece of jewelry. If the pearls are to be enjoyed rather of an investment item, than none of the grading rules jewelers use actually matter.