Magic Diamond Glow didnt have a purse...each of the set came with 5 accessories [6 if you include the hat], colour co-ordinated to match the jewels in her pink amulet of course lol!
Diamond Glow had a red tutu, yellow ring, blue star shaped comb, green crown and white wings. So essentially her red tutu replaces the red purse that Star Swirl has.
Hope that helps!