Teething Necklace

So, my sweet little Luke LOVES to grab my necklace! I love that he will lay on my chest or while I am holding him and play with it, but he tries to bring it to his mouth! It is too short, and I wouldn't want him to chew on it (because it is metal). Well I have been researching teething necklaces and found one that I love! It is $29.00, but its super cute! Do any of you have teething necklaces? Are they worth it? I want to make sure it is a good investment before I buy one. Any suggestions?

This is the one I found that I like!
It is from http://store.chewbeads.com/