My girlfriend has made mention of wanting salt-water pearls (I guess, as opposed to freshwater ones?), and I was hoping to go a little xmas shopping over the weekend. However, after doing a little bit of browsing online, I realize that I HAVE NO CLUE ABOUT PEARLS! I don't know which kind is better, tahitian pearls or akoya pearls or black sea pearls....I'd like to know a little about them all before I go into a jewelry store so they don't take me for a sucker and try and jack up their prices. Any sort of insight would be greatly appreciated!