During the song "You Can't Hurry Love" Diana Ross loses her earring. If you watch closely, you can see her chuck it upstage as she begins the medley.
The Supremes knew they had a hit when the performed 'You can't hurry love'. You can see it in their performance. Truly awsome. Wearing silver 'piette' gowns, they sparkled like the stars that they are for the world to see.