The purple stars are for a Global Moderator ~ Me.
I prefer to think of them as a different shade of blue. If you squint and cross yours eyes and hold your breath until you almost pass out, that last second, when you feel light headed and dizzy, if you continue to squint with your eyes crossed, they really are blue. In fact, I like to believe they're Kentucky Blue.
Hello Icno! The reason I'm asking I've seen purple stars on three other profiles and when I went back for a second look they're gone. I thought my eyes were playing tricks on me. lol