This is great. I picked out the birthstones for our whole family and gave it to my mom for Christmas and she absolutely LOVED it. I was lucky though, that all 8 people I included had a different birth month, because there are no repeat stones. You would have to buy doubles separately. I really like how the stones are so easily interchangeable though. Its just held together with a magnet - strong enough that it seems very secure, but you can still open it when needed. So when more grandchildren appear, I can add stones to her necklace, or replace the stones she has with real versions because based on the price, Im sure these were all glass or crystal or colored CZ or something.