Make sure you register for birthday rewards a few months before your birthday. Here are some gifts I have received: $10 gift card to Victoria's Secret, $25 to Williams Sonoma (you must have their credit card), sample makeup from Ulta and Sephora, a sandwich from Honey Baked Ham, and a silver necklace from Helzberg Diamonds.
That is awesome you get a free necklace during your birthday month! I still need to pick up my freebie from Sephora!
From what I heard, once you register for the club, they select people at random. I got selected once. Some people get selected multiple times, and some never. I was happy with what I got.