I never heard tell of any such thing. I did not have a Greek boyfriend in college, and it would have been a nice thing for me to have. Those things mean a great deal. He often expressed a desire to give me something like a pin, but there was nothing like pearling. Since he is married to someone else in Memphis now, and I am married to someone else in NY, I guess the point is moot for me, but at the time it would have been lovely.
