Was hesitant to order, but glad I did.  They're not 6mm, probably 7 or 8mm.  But that's okay with me for these.  Another commenter (and I) wondered how could people tell them from plastic?  Well, I think that those who know amber would see immediately that they're real.  But I think that even those who aren't familiar with amber can see that they're way too complex to be plastic.  In short, they're real, and they look real.  Bling exceeds expectations again!