I've wanted a strand of opera length pearls since the mid-eighties. That was when the movie "St. Elmo's Fire" came out and I think in one scene that's all that Ally Sheedy's character wears.
J. Crew has come out with a long strand of real freshwater pearls ($495). These are 7.5-8mm pearls on a 54" strand. They are still a little pricey so I probably won't buy these for myself, but if anyone out there wants to make me REALLY HAPPY...:-)