Apatite stones hang on a silk string thread (color choice is for the string). The piece connects together with a sterling silver clasp. Choose the string color in the drop-down menu. Each stone is unique and measures on average approximately 2-3mm, and group of stone measures approximately 1 inch long. Clasps with a sterling silver clasp. Comes on a card with the quote, "Wish upon this charm as you put this necklace on. When the thread wears out, believe your wish will come true." If you would like a longer or shorter string, let me know when you checkout what length you would like.