Can someone please explain what is the difference between POJ's gem grade, metallic and AAA classified pearls? I am planning to treat myself to some studs for my birthday in October ( I am from India and it takes a month for the shipping). Or will I be better off with 7-7.5 mm akoya studs (hanadamas are completely out of budget). I would like to wear the studs on a daily basis and my office dress code is fairly conservative. I am 5'2" and on the heavier side, with small earlobes (for a sense of proportion size-wise, 0.23 ct diamond studs look fairly ok on me).