At Delta Gamma, you give the NM pin back. However, I am thinking of buying one to pin on a "Hannah" doll (you can do this through Anchor Trader, the "boutique" that is in our magazine, The Anchora of Delta Gamma).
It is my understanding that it is permissible for Hannah to wear the NM pin or the initiate's badge. I loved my NM pin and thought it was very beautiful in its simplicity.
