Hello,
I was wondering if someone can enlighten me about pearls? I know about fresh water pearls but what are other pearls?

Basically, I've bought a few, some that were called grade A glass pearls which were good quality and other pearls I bought that were just called pearls and they appear to be some kind of cheap coating on a white bead. What should I be looking out for?

Also can anyone recommend somewhere I can buy good quality white round pearls in different sizes?

Much appreciated.