You look wonderful in the pearls!
It could be that the bracelet is closer to 7mm and the strand closer to 6mm. Did you have a chance to measure it?
For Pearl Paradise, I do not think that roundness between AAA and Freshadamas make a difference. I believe the selection between AAA and Freshadamas is orient. For Purepearls, Amanda tries to go for rounds. For your strand I don't see it as egg shaped from a distance (ie, from your neck shot).
The luster is indeed surprising.