I actually started this reply a few days ago and was interrupted, so I am going to finish it now.a03b|1465534650|4042521 said:Or are there any exceptions?
I agree with what others have said. The exceptions would generally be confined to large stones as the allowable inclusion size scales up with the size of the stone. And of course there are cases of mis-grades, which are generally not challenged by dealers who receive the benefit!The_Diamond_Connoisseur|1465938155|4043998 said:Some larger (5 carat plus) VS1 stones may not be eye clean especially Step cuts. I remember returning a 1.5 carat Round VS1 to a supplier who said I gave him the wrong stone back as it wasn't eye clean. After rechecking under magnification and comparing it to the GIA cert he said "wow this was a lucky VS1". Generally speaking VS1's should be eye clean, but as with all diamonds you should have an expert inspect it for you.