Looking for a book called "the golden circle"

Hello.  I am looking for a book that I read as a teenager in the mid 60’s.  I think it was called the golden circle.  I remember that it had a girl named Kit as the main character, a girl named Debra, and Tante Debra, Kit’s aunt.  The basic premise is that Kit is new at a school which has a sorority in high school and they wore golden circle pins on their sweaters. 

I loved this book as a kid and would love to find it for my granddaughter.  I have looked to no avail so any help you could give me would be greatly appreciated.