If you want a really really long string of pearls that you can loop several times, these will work for that.  However, not one of these is a regular round shape, it is pretty much just a long string of large misshapen freshwater pearls.  Also, these are just strung on the cord (not knotted).  If you just want something cheap for the look of pearls this will do the trick, but don't wear these if you are trying to impress someone.