All charms will fit on any of my Charm-Changers. They also have the the option of being made into a necklace. Charms are not removable on a necklace. All of my jewelry has a 2 year warranty. If there is a problem please email me. It will be the customer’s responsibility to mail the jewelry to me and I will return it repaired or a replacement. Just for fun, Charm-Changers are named after after our furry family members both past and present. You can see their pictures on the listings.