The First Lady knows how to rock these gems. A quick search of pictures of her and you'll see she favors a classy single strand for a majority of events. They dress the black tee up quite a bit, but I'm bias as I can't seem to find a reason to take mine off.
I also pictured her here with a cluster of strands similar to Kathrine Heigl. If you're looking at a fun piece of jewelry to dress up an evening gown, this is obviously in style.

