What does Jimmy catch on a woman's glove?

When Jimmy is leaving the bandstand at the Harlem Club to follow Francine, he makes his way through the crowd on the dance floor and passes a woman in a purple dress and yellow gloves. He apparently catches something on her glove because he stops to unsnag it. I've replayed the scene a few times and still can't tell what it is. Is it a ring? A cuff link? A car key?