I'm new to this website and quite uneducated when it comes to diamonds. Anyway, my boyfriend got me some diamond earrings for Christmas and he said the jeweler told him that they were "A Quality" as opposed to "B Quality." I'm familiar with the 4 C's of diamonds but I'd never heard of "A Quality." Is this something the jeweler created to indicate a range of clarity? Any information on this would be greatly appreciated! THANKS!